[KPM] Implement initial IdeaKotlinProjectModelBuilder

- Introduce `kotlin-gradle-plugin-idea` module that allows
to share models between the IDE and KGP

- Add `kotlin-gradle-plugin-idea` to the RuntimePublicAPITest to
ensure binary compatibility

^KT-51262

buildSrc/src/main/kotlin/tasks.kt

@@ -40,6 +40,7 @@ val kotlinGradlePluginAndItsRequired = arrayOf(
     ":kotlin-daemon-client",
     ":kotlin-project-model",
     ":kotlin-gradle-plugin-api",
+    ":kotlin-gradle-plugin-idea",
     ":kotlin-gradle-plugin",
     ":kotlin-gradle-plugin-model",
     ":kotlin-tooling-metadata",