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

compiler/testData/codegen/light-analysis/annotations/kt10136.txt

@@ -1,19 +1,23 @@
 @java.lang.annotation.Retention
+@kotlin.Metadata
 public annotation class A
 
 @kotlin.annotation.Target
 @kotlin.annotation.Retention
 @java.lang.annotation.Retention
 @java.lang.annotation.Target
+@kotlin.Metadata
 public annotation class B {
     public abstract method items(): A[]
 }
 
 @B
+@kotlin.Metadata
 public final class C {
     public method <init>(): void
 }
 
+@kotlin.Metadata
 public final class Kt10136Kt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }