Kapt3: Write stub class files with metadata (needed for incremental compilation)

compiler/testData/codegen/light-analysis/classes/initializerBlockDImpl.txt

@@ -1,7 +1,9 @@
+@kotlin.Metadata
 public final class InitializerBlockDImplKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }
 
+@kotlin.Metadata
 public final class World {
     private final @org.jetbrains.annotations.NotNull field foo: World.Item
     private final @org.jetbrains.annotations.NotNull field items: java.util.ArrayList
@@ -11,6 +13,7 @@ public final class World {
     public final @org.jetbrains.annotations.NotNull method getItems(): java.util.ArrayList
 }
 
+@kotlin.Metadata
 public final class World/Item {
     synthetic final field this$0: World
     inner class World/Item