[K/N] Consolidate forward declarations handling

This is refactoring in preparation for KT-59764.
Names and layout of forward declarations related classes
was copy-pasted many times over compiler code.

Implementing KT-59764 would require copy-pasting it two more times.
So instead of doing this it was put in single place.

No behaviour changes intended in this commit.

native/commonizer/build.gradle.kts

@@ -27,6 +27,7 @@ dependencies {
     compileOnly(project(":compiler:cli-common"))
     compileOnly(project(":compiler:ir.serialization.common"))
     compileOnly(project(":compiler:frontend"))
+    compileOnly(project(":core:compiler.common.native"))
     compileOnly(project(":native:frontend.native"))
     compileOnly(project(":kotlin-util-klib-metadata"))
     compileOnly(intellijCore())