[Gradle] Implement kotlin-gradle-plugin-annotations module

This will include Internal* and *Experimental annotations for the
Kotlin Gradle Plugin. The separate module is proposed, so that
additional modules can use those annotations without
a dependency to the full kotlin-gradle-plugin-api module
(see -idea modules)

^KT-54029 WIP

libraries/tools/kotlin-gradle-plugin-api/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
 }
 
 dependencies {
+    commonApi(project(":kotlin-gradle-plugin-annotations"))
     commonApi(project(":native:kotlin-native-utils"))
     commonApi(project(":kotlin-project-model"))
     commonImplementation(project(":kotlin-tooling-core"))