Add Gradle-like API for adding dependencies

jupyter-lib/api/src/main/kotlin/org/jetbrains/kotlinx/jupyter/api/libraries/gradleLike.kt

@@ -0,0 +1,45 @@
+package org.jetbrains.kotlinx.jupyter.api.libraries
+
+import java.io.File
+
+interface RepositoryHandlerScope {
+    fun maven(url: String)
+    fun dir(dir: File)
+}
+
+interface DependencyHandlerScope {
+    fun implementation(coordinates: String)
+    fun implementation(group: String, artifact: String, version: String)
+}
+
+fun RepositoryHandlerScope.mavenCentral() = maven("https://repo.maven.apache.org/maven2/")
+fun RepositoryHandlerScope.google() = maven("https://dl.google.com/dl/android/maven2/")
+fun RepositoryHandlerScope.mavenLocal() = maven("*mavenLocal")
+
+fun JupyterIntegration.Builder.repositories(action: RepositoryHandlerScope.() -> Unit) {
+    RepositoryHandlerScopeImpl(this).action()
+}
+
+fun JupyterIntegration.Builder.dependencies(action: DependencyHandlerScope.() -> Unit) {
+    DependencyHandlerScopeImpl(this).action()
+}
+
+private class RepositoryHandlerScopeImpl(private val builder: JupyterIntegration.Builder) : RepositoryHandlerScope {
+    override fun dir(dir: File) {
+        builder.repositories(dir.absolutePath)
+    }
+
+    override fun maven(url: String) {
+        builder.repositories(url)
+    }
+}
+
+private class DependencyHandlerScopeImpl(private val builder: JupyterIntegration.Builder) : DependencyHandlerScope {
+    override fun implementation(coordinates: String) {
+        builder.dependencies(coordinates)
+    }
+
+    override fun implementation(group: String, artifact: String, version: String) {
+        implementation("$group:$artifact:$version")
+    }
+}

jupyter-lib/lib/src/main/kotlin/jupyter/kotlin/ScriptTemplateWithDisplayHelpers.kt

@@ -20,7 +20,7 @@ abstract class ScriptTemplateWithDisplayHelpers(
 
     fun EXECUTE(code: String) = host.scheduleExecution(CodeExecution(code).toExecutionCallback())
 
-    fun USE(library: LibraryDefinition) = host.addLibrary(library)
+    fun USE(library: LibraryDefinition) = host.scheduleExecution { addLibrary(library) }
 
     fun USE(builder: JupyterIntegration.Builder.() -> Unit) {
         val o = object : JupyterIntegration() {

src/test/kotlin/org/jetbrains/kotlinx/jupyter/test/repl/ReplTests.kt

@@ -140,6 +140,26 @@ class ReplTests : AbstractSingleReplTest() {
         res.sortedMatches().contains("doyaaaaaken")
     }
 
+    @Test
+    fun testDependencyConfigurationAnnotationCompletion() {
+        eval(
+            """
+                USE {
+                    repositories {
+                        mavenCentral()
+                    }
+                    dependencies {
+                        implementation("io.github.config4k:config4k:0.4.2")
+                    }
+                }
+            """.trimIndent()
+        )
+
+        val res = repl.completeBlocking("import io.github.", 17)
+        res.shouldBeInstanceOf<CompletionResult.Success>()
+        res.sortedMatches().contains("config4k")
+    }
+
     @Test
     fun testExternalStaticFunctions() {
         val res = eval(