[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

buildSrc/src/main/kotlin/tasks.kt

@@ -44,6 +44,7 @@ val kotlinGradlePluginAndItsRequired = arrayOf(
     ":kotlin-daemon-client",
     ":kotlin-project-model",
     ":kotlin-gradle-plugin-api",
+    ":kotlin-gradle-plugin-annotations",
     ":kotlin-gradle-plugin-idea",
     ":kotlin-gradle-plugin-idea-proto",
     ":kotlin-gradle-plugin",