[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

libraries/tools/binary-compatibility-validator/ReadMe.md

@@ -7,7 +7,7 @@ and ensure that the public binary API wasn't changed in a way that make this cha
 
 Compile and run tests. `CasesPublicAPITest` verifies the tool itself, 
 and `RuntimePublicAPITest` dumps the public API of `kotlin-stdlib`, 
-`kotlin-stdlib-jdk7/8`, and `kotlin-reflect` jars,
+`kotlin-stdlib-jdk7/8`, `kotlin-reflect` and `kotlin-gradle-plugin-idea` jars,
 which must be built beforehand with gradle. Use `clean assemble` tasks,
 since the incremental compilation currently doesn't produce all the required output.
 

libraries/tools/binary-compatibility-validator/build.gradle

@@ -14,6 +14,7 @@ dependencies {
     testArtifacts project(':kotlin-stdlib-jdk7')
     testArtifacts project(':kotlin-stdlib-jdk8')
     testArtifacts project(':kotlin-reflect')
+    testArtifacts project(':kotlin-gradle-plugin-idea')
 }
 
 pill {

libraries/tools/binary-compatibility-validator/src/test/kotlin/org.jetbrains.kotlin.tools.tests/RuntimePublicAPITest.kt

@@ -33,6 +33,10 @@ class RuntimePublicAPITest {
         snapshotAPIAndCompare("../../reflect/api/build/libs", "kotlin-reflect-api(?!-[-a-z]+)", nonPublicPackages = listOf("kotlin.reflect.jvm.internal"))
     }
 
+    @Test fun kotlinGradlePluginIdea() {
+        snapshotAPIAndCompare("../kotlin-gradle-plugin-idea/build/libs", "kotlin-gradle-plugin-idea(?!-[-a-z]+)")
+    }
+
     private fun snapshotAPIAndCompare(
         basePath: String,
         jarPattern: String,