chore: start v8 development (#1951)

### 📝 Description

Bumps the gradle version to 8.0.0-SNAPSHOT and cuts the v7 docs. 

Files of interest are `gradle.properties` (bumps lib version) and
`website/docusaurus.config.js` + `website/versions.json` (which cuts new
v8 version but still point to v7 as current).

All the docs under `website/versioned_docs/*` and
`website/versioned_sidebars/version-7.x.x-sidebars.json` were auto
generated by docusaurus when cutting v7 version. `website/docs` are now
source of the v8 docs.

### 🔗 Related Issues

gradle.properties

@@ -1,5 +1,5 @@
 group = com.expediagroup
-version = 7.0.0-SNAPSHOT
+version = 8.0.0-SNAPSHOT
 
 # build config
 org.gradle.caching=true

website/docusaurus.config.js

@@ -21,14 +21,14 @@ module.exports = {
       {
         docs: {
           editUrl: "https://github.com/ExpediaGroup/graphql-kotlin/tree/master/website",
-          lastVersion: 'current',
+          lastVersion: '7.x.x',
           showLastUpdateAuthor: true,
           showLastUpdateTime: true,
           sidebarPath: require.resolve('./sidebars.js'),
           versions: {
             current: {
-              label: '7.x.x',
-              path: ''
+              label: 'pre-release',
+              path: '8.x.x'
             }
           }
         }

website/versioned_docs/version-7.x.x/blogs-and-videos.md

@@ -0,0 +1,34 @@
+---
+id: blogs-and-videos
+title: Blogs & Videos
+---
+Here are some links to other blog posts and videos which may provide further examples and reading.
+
+## graphql-kotlin
+
+Articles and videos specifically about `graphql-kotlin`
+
+-   📺  [Supercharge your GraphQL with Ktor and GraalVM (Dariusz Kuc)(KotlinConf 2023)](https://www.youtube.com/watch?v=gqQwTFeHOUU&list=PLlFc5cFwUnmwcJ7ZXyMmS70A9QFyUu1HI) (en)
+-   📝  [GraphQL Kotlin 6.0.0 Release](https://medium.com/expedia-group-tech/graphql-kotlin-6-0-0-release-2227fd066dcd)
+-   📝  [GraphQL Kotlin 4.0.0 Release](https://medium.com/expedia-group-tech/graphql-kotlin-4-0-0-release-eb87e150a192)
+-   📺  [Bootiful GraphQL with Kotlin (Dariusz Kuc, Guillaume Scheibel)(Spring One 2020)](https://www.youtube.com/watch?v=t9He4vHZC24) (en)
+-   📺  [Bootiful GraphQL with Kotlin (Dariusz Kuc)(GOTO Chicago 2020)](https://www.youtube.com/watch?v=1siPT1pTXFU) (en)
+-   📝  [Introducing GraphQL Kotlin Client](https://medium.com/expedia-group-tech/introducing-graphql-kotlin-client-b32dc3061a6f)
+-   📝  [Announcing graphql-kotlin 2.0!](https://medium.com/expedia-group-tech/graphql-kotlin-2-0-4006ea41f774)
+-   📺  [Bootiful GraphQL with Kotlin (Dariusz Kuc, Guillaume Scheibel)(KotlinConf 2019)](https://www.youtube.com/watch?v=7YJyPXjLdug&index=25) (en)
+-   📝  [Creating a Reactive GraphQL Server with Spring Boot and Kotlin](https://medium.com/expedia-group-tech/creating-a-reactive-graphql-server-with-spring-boot-and-kotlin-54aca7316470)
+-   📝  [Apollo Federation in a GraphQL Kotlin Server](https://medium.com/expedia-group-tech/apollo-federation-in-a-graphql-kotlin-server-115cea51607a)
+-   📝  [Creating GraphQL Schemas in Kotlin](https://medium.com/expedia-group-tech/creating-graphql-schemas-in-kotlin-aaaac0ab0672)
+-   📝  [Release of graphql-kotlin 1.0.0!](https://medium.com/expedia-group-tech/release-of-graphql-kotlin-1-0-0-791ad85d3116)
+-   📝  [graphql-kotlin: Generate a GraphQL schema from Kotlin code](https://medium.com/expedia-group-tech/graphql-kotlin-generate-a-graphql-schema-from-kotlin-code-21d1dc2f6e27)
+
+## GraphQL
+
+Articles and videos about how Expedia Group is using GraphQL
+
+-   📝  [Expedia Group Case Study: Bootiful APIs With GraphQL and Kotlin](https://kotlinlang.org/lp/server-side/case-studies/expedia)
+-   📝  [Expedia Group Transforms Product Development with Apollo](https://www.apollographql.com/customers/expediagroup/)
+-   📺  [Creating a federated schema for a global company (Shane Myrick)](https://youtu.be/MuD3TAP0D9Y) (en)
+-   📺  [Migrer ses APIs vers GraphQL: pourquoi? comment! (Guillaume Scheibel)](https://youtu.be/IRIkpvJo95s) (fr)
+-   📺  [Migrate your APIs to GraphQL: how? and why! (Guillaume Scheibel)](https://youtu.be/IkPMpzQ-TRI) (en)
+-   📺  [Transforming customer experiences and your organization with GraphQL (Jim Gust, Dan Boerner)](https://youtu.be/Jt-ZD4zj4Ow) (en)

website/versioned_docs/version-7.x.x/client/client-customization.mdx

@@ -0,0 +1,126 @@
+---
+id: client-customization
+title: Client Customization
+---
+
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+## Ktor HTTP Client Customization
+
+`GraphQLKtorClient` is a thin wrapper on top of [Ktor HTTP Client](https://ktor.io/docs/client.html) and supports fully
+asynchronous non-blocking communication. It is highly customizable and can be configured with any supported Ktor HTTP
+[engine](https://ktor.io/clients/http-client/engines.html) and [features](https://ktor.io/clients/http-client/features.html).
+
+See [Ktor HTTP Client documentation](https://ktor.io/clients/index.html) for additional details.
+
+### Global Client Customization
+
+A single instance of `GraphQLKtorClient` can be used to handle many GraphQL operations. You can specify a custom instance
+of Ktor `HttpClient` and a target `GraphQLClientSerializer`.
+
+The below example configures a new `GraphQLKtorClient` to use the `OkHttp` engine with custom timeouts, adds a default `X-MY-API-KEY`
+header to all requests, and enables basic logging of the requests.
+
+```kotlin
+val okHttpClient = HttpClient(engineFactory = OkHttp) {
+    engine {
+        config {
+            connectTimeout(10, TimeUnit.SECONDS)
+            readTimeout(60, TimeUnit.SECONDS)
+            writeTimeout(60, TimeUnit.SECONDS)
+        }
+    }
+    defaultRequest {
+        header("X-MY-API-KEY", "someSecretApiKey")
+    }
+    install(Logging) {
+        logger = Logger.DEFAULT
+        level = LogLevel.INFO
+    }
+}
+val client = GraphQLKtorClient(
+    url = URL("http://localhost:8080/graphql"),
+    httpClient = okHttpClient
+)
+```
+
+### Per Request Customization
+
+Individual GraphQL requests can be customized through [HttpRequestBuilder](https://ktor.io/docs/request.html#customizing-requests).
+You can use this mechanism to specify custom headers, update target url to include custom query parameters, configure
+attributes that can be accessed from the pipeline features as well specify timeouts per request.
+
+```kotlin
+val helloWorldQuery = HelloWorldQuery(variables = HelloWorldQuery.Variables(name = "John Doe"))
+val result = client.execute(helloWorldQuery) {
+    header("X-B3-TraceId", "0123456789abcdef")
+}
+```
+
+## Spring WebClient Customization
+
+`GraphQLWebClient` is a thin wrapper on top of [Spring WebClient](https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/reactive/function/client/WebClient.html)
+that relies on Reactor Netty for fully asynchronous non-blocking communications. If you want to use Jetty instead you will
+need to exclude provided `io.projectreactor.netty:reactor-netty` dependency and instead add `org.eclipse.jetty:jetty-reactive-httpclient`
+dependency.
+
+### Global Client Customization
+
+A single instance of `GraphQLWebClient` can be used to handle many GraphQL operations and you can customize it by providing
+a custom instance of `WebClient.Builder`. See [Spring documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-webclient-customization)
+for additional details.
+
+Example below configures `GraphQLWebClient` with custom timeouts and adds a default `X-MY-API-KEY` header to all requests.
+
+```kotlin
+val httpClient: HttpClient = HttpClient.create()
+    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000)
+    .responseTimeout(Duration.ofMillis(10_000))
+val connector: ClientHttpConnector = ReactorClientHttpConnector(httpClient.wiretap(true))
+val webClientBuilder = WebClient.builder()
+    .clientConnector(connector)
+    .defaultHeader("X-MY-API-KEY", "someSecretApiKey")
+
+val client = GraphQLWebClient(
+    url = "http://localhost:8080/graphql",
+    builder = webClientBuilder
+)
+```
+
+### Per Request Customization
+
+Individual GraphQL requests can be customized by providing `WebClient.RequestBodyUriSpec` lambda. You can use this mechanism
+to specify custom headers or include custom attributes or query parameters.
+
+```kotlin
+val helloWorldQuery = HelloWorldQuery(variables = HelloWorldQuery.Variables(name = "John Doe"))
+val result = client.execute(helloWorldQuery) {
+    header("X-B3-TraceId", "0123456789abcdef")
+}
+```
+
+## Custom GraphQL Client
+
+GraphQL Kotlin libraries provide generic a `GraphQLClient` interface as well as Ktor HTTP Client and Spring WebClient based
+reference implementations. Both `GraphQLKtorClient` and `GraphQLWebClient` are open classes which means you can also
+extend them to provide some custom `execute` logic.
+
+```kotlin
+class CustomGraphQLClient(url: URL) : GraphQLKtorClient(url = url) {
+
+    override suspend fun <T: Any> execute(request: GraphQLClientRequest<T>, requestCustomizer: HttpRequestBuilder.() -> Unit): GraphQLClientResponse<T> {
+        // custom init logic
+        val result = super.execute(request, requestCustomizer)
+        // custom finalize logic
+        return result
+    }
+}
+```
+
+## Deprecated Field Usage
+
+Build plugins will automatically fail generation of a client if any of the specified query files are referencing
+deprecated fields. This ensures that your clients have to explicitly opt-in into deprecated usage by specifying
+`allowDeprecatedFields` configuration option.