Split LightClassGenerationSupport into separate entities

LightClassGenerationSupport:
    Includes utilities related to generating light classes
    Primary client of this service are KtLight* implementation classes
KotlinAsJavaSupport:
    Provides APIs to transform kotlin code into Psi* entities
    Primary client of this service is JavaElementFinder

idea/tests/org/jetbrains/kotlin/asJava/KotlinLightClassInheritorTest.kt

@@ -49,7 +49,7 @@ class KotlinLightClassInheritorTest : KotlinLightCodeInsightFixtureTestCase() {
     private fun doTestInheritorByText(text: String, superQName: String, checkDeep: Boolean) {
         val file = myFixture.configureByText("A.kt", text) as KtFile
         val jetClass = file.declarations.filterIsInstance<KtClass>().single()
-        val psiClass = LightClassGenerationSupport.getInstance(project).getLightClass(jetClass)!!
+        val psiClass = KotlinAsJavaSupport.getInstance(project).getLightClass(jetClass)!!
         val baseClass = JavaPsiFacade.getInstance(project).findClass(superQName, GlobalSearchScope.allScope(project))!!
         Assert.assertTrue(psiClass.isInheritor(baseClass, checkDeep))
     }

idea/tests/org/jetbrains/kotlin/asJava/KtFileLightClassTest.kt

@@ -58,14 +58,14 @@ class KtFileLightClassTest : KotlinLightCodeInsightFixtureTestCase() {
     fun testNoFacadeForScript() {
         val file = myFixture.configureByText("foo.kts", "package foo") as KtFile
         assertEquals(0, file.classes.size)
-        val facadeFiles = LightClassGenerationSupport.getInstance(project).findFilesForFacade(FqName("foo.FooKt"), GlobalSearchScope.allScope(project))
+        val facadeFiles = KotlinAsJavaSupport.getInstance(project).findFilesForFacade(FqName("foo.FooKt"), GlobalSearchScope.allScope(project))
         assertEquals(0, facadeFiles.size)
     }
 
     fun testNoFacadeForHeaderClass() {
         val file = myFixture.configureByText("foo.kt", "header fun foo(): Int") as KtFile
         assertEquals(0, file.classes.size)
-        val facadeFiles = LightClassGenerationSupport.getInstance(project).findFilesForFacade(FqName("foo.FooKt"), GlobalSearchScope.allScope(project))
+        val facadeFiles = KotlinAsJavaSupport.getInstance(project).findFilesForFacade(FqName("foo.FooKt"), GlobalSearchScope.allScope(project))
         assertEquals(0, facadeFiles.size)
     }