[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/defaultPackage.fir.txt

@@ -1,3 +1,12 @@
+/**
+ * public final class AnotherRootClass : kotlin/Any {
+ *
+ *   // signature: <init>()V
+ *   public constructor()
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 public final class AnotherRootClass {
 
@@ -9,6 +18,15 @@ public final class AnotherRootClass {
 ////////////////////
 
 
+/**
+ * public final class RootClass : kotlin/Any {
+ *
+ *   // signature: <init>()V
+ *   public constructor()
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 public final class RootClass {
 
@@ -37,6 +55,21 @@ public @interface ClassRefAnnotation {
 
 package test;
 
+/**
+ * public abstract interface test/PackedClass : kotlin/Any {
+ *
+ *   // signature: oneMoreMethod()LAnotherRootClass;
+ *   public abstract fun oneMoreMethod(): AnotherRootClass
+ *
+ *   // signature: otherMethod()Ljava/lang/Number;
+ *   public abstract fun otherMethod(): java/lang/Number
+ *
+ *   // signature: someMethod()LRootClass;
+ *   public abstract fun someMethod(): RootClass
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 public abstract interface PackedClass {
 
@@ -54,6 +87,15 @@ public abstract interface PackedClass {
 
 package test;
 
+/**
+ * public final class test/PackedWithAnnotation : kotlin/Any {
+ *
+ *   // signature: <init>()V
+ *   public constructor()
+ *
+ *   // module name: main
+ * }
+ */
 @kotlin.Metadata()
 @ClassRefAnnotation(value = {RootClass.class})
 public final class PackedWithAnnotation {