[KAPT4] KT-51982 Implement generation of @Metadata annotations in Java stubs

Also adds rendering of @Metadata annotations in Kapt3 and Kapt4 tests
(currently disabled for a few tests).

Co-authored-by: Alexander Udalov <alexander.udalov@jetbrains.com>

plugins/kapt3/kapt3-compiler/testData/converter/multifileClass.txt

@@ -1,5 +1,11 @@
 package test;
 
+/**
+ * multi-file class {
+ *   // test/M1__AKt
+ *   // test/M1__BKt
+ * }
+ */
 @kotlin.Metadata()
 public final class M1 {
 
@@ -18,6 +24,11 @@ public final class M1 {
 
 package test;
 
+/**
+ * multi-file class {
+ *   // test/M2__CKt
+ * }
+ */
 @kotlin.Metadata()
 public final class M2 {