[SLC] SymbolKotlinAsJavaSupport: implement getKotlinInternalClasses

^KTIJ-24067

compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.java

@@ -0,0 +1 @@
+// NOT_GENERATED

compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt

@@ -0,0 +1,6 @@
+// test.MultiFile__InternalFacadeClassKt
+// WITH_STDLIB
+@file:[JvmMultifileClass JvmName("MultiFile")]
+package test
+
+val foo = 42

compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.lib.java

@@ -0,0 +1,5 @@
+final class MultiFile__InternalFacadeClassKt /* test.MultiFile__InternalFacadeClassKt*/ {
+  private static final int foo;
+
+  public static final int getFoo();//  getFoo()
+}