[Gradle] Implement KotlinProjectSetupAction extensionPoint

KT-61634

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPluginWrapper.kt

@@ -263,6 +263,8 @@ abstract class KotlinBasePluginWrapper : DefaultKotlinBasePlugin() {
 
         plugin.apply(project)
 
+        project.runKotlinProjectSetupActions()
+
         project.addNpmDependencyExtension()
 
         project.registerBuildKotlinToolingMetadataTask()

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinProjectSetupAction.kt

@@ -0,0 +1,21 @@
+package org.jetbrains.kotlin.gradle.plugin
+
+import org.gradle.api.Project
+
+/**
+ * Generic action to configure/set up a Kotlin Gradle Project.
+ * Will be invoked after the KotlinPluginWrapper applied the underlying Kotlin Gradle Plugin
+ */
+internal fun interface KotlinProjectSetupAction {
+    fun Project.invoke()
+
+    companion object {
+        val extensionPoint = KotlinGradlePluginExtensionPoint<KotlinProjectSetupAction>()
+    }
+}
+
+internal fun Project.runKotlinProjectSetupActions() {
+    KotlinProjectSetupAction.extensionPoint[this].forEach { action ->
+        with(action) { invoke() }
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/registerKotlinPluginExtensions.kt

@@ -31,6 +31,10 @@ import org.jetbrains.kotlin.gradle.plugin.diagnostics.checkers.WasmSourceSetsNot
  * Active Extensions (using the [KotlinGradlePluginExtensionPoint] infrastructure) will be registered here by the Kotlin Gradle Plugin.
  */
 internal fun Project.registerKotlinPluginExtensions() {
+
+    KotlinProjectSetupAction.extensionPoint.apply {
+    }
+
     KotlinGradleProjectChecker.extensionPoint.apply {
         register(project, CommonMainOrTestWithDependsOnChecker)
         register(project, DeprecatedKotlinNativeTargetsChecker)