Reorganize project files & reduce public interface

[rebello95]

Reorganizes files in the project to be more clearly and consistently organized by visibility (whether the types within each file should be internal to the package or public). Also reduces the public interface of the module by moving some types to internal or package.

Note that package is specific to SPM, so the keyword cannot be used in conjunction with CocoaPods. For this reason, a few of the types are guarded with #if COCOAPODS. It's also worth noting that ConnectNIO cannot be consumed via CocoaPods today because NIO does not support CocoaPods. For this reason, the shared gRPC interfaces between Connect and ConnectNIO don't need to be exposed to CocoaPods at all. Additionally, package requires Swift 5.9, so the Swift package version has been updated as well.

New directory structure:

.
├── Examples
│   ├── ElizaCocoaPodsApp
│   ├── ElizaSharedSources
│   │   ├── AppSources
│   │   └── GeneratedSources
│   │       └── connectrpc
│   │           └── eliza
│   │               └── v1
│   └── ElizaSwiftPackageApp
│       └── ElizaSwiftPackageApp
├── Libraries
│   ├── Connect
│   │   ├── Internal
│   │   │   ├── Generated
│   │   │   │   └── grpc
│   │   │   │       └── status
│   │   │   │           └── v1
│   │   │   ├── Interceptors
│   │   │   ├── Locks
│   │   │   ├── Streaming
│   │   │   └── Unary
│   │   ├── PackageInternal
│   │   ├── Public
│   │   │   ├── Implementation
│   │   │   │   ├── Clients
│   │   │   │   ├── Codecs
│   │   │   │   └── Compression
│   │   │   └── Interfaces
│   │   │       ├── Interceptors
│   │   │       └── Streaming
│   │   │           ├── AsyncAwait
│   │   │           └── Callbacks
│   │   └── proto
│   │       └── grpc
│   │           └── status
│   │               └── v1
│   ├── ConnectMocks
│   └── ConnectNIO
│       ├── Internal
│       │   └── Extensions
│       └── Public
├── Plugins
│   ├── ConnectMocksPlugin
│   ├── ConnectPluginUtilities
│   └── ConnectSwiftPlugin
└── Tests
    ├── ConnectLibraryTests
    │   ├── ConnectConformance
    │   ├── ConnectMocksTests
    │   ├── ConnectTests
    │   ├── Generated
    │   │   ├── connectrpc
    │   │   │   └── conformance
    │   │   │       └── v1
    │   │   └── server
    │   │       └── v1
    │   └── TestResources
    └── ConnectPluginUtilitiesTests

[rebello95]

Re-implements Locked using NIO's locks so that the Connect.Locked can stay internal

[eseay]

Actually - quick question before approval.

[eseay]

Have we confirmed that this is not going to cause issues? I have heard and experienced at some point in the past that using unsafe flags causes issues with downstream consumers of the dependency.

[rebello95]

Given the Eliza SwiftPM app builds fine with the Connect package I think it's okay? Do you know what else we should check? I'm not familiar with those issues

[eseay]

@rebello95 could we try archiving the Eliza app as a Release IPA? I think that would tell us.

[rebello95]

Yep, archiving seemed to work fine:

[eseay]

Ok cool!

[rebello95]

Seems you were right 🙃 #217