Kapt: Store line information in a file doc comment, instead of annotations (KT-21936)

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

@@ -1,39 +1,23 @@
+/**
+ * @KaptMetadata
+ */
+
+import java.lang.System;
+
 @kotlin.Metadata()
-@kapt.internal.KaptMetadata()
 public final class GenericRawSignatures {
 
     @org.jetbrains.annotations.Nullable()
-    @kapt.internal.KaptSignature(value = "genericFun()Ljava/lang/Object;")
     public final <T extends java.lang.Object>T genericFun() {
         return null;
     }
 
     @org.jetbrains.annotations.Nullable()
-    @kapt.internal.KaptSignature(value = "nonGenericFun()Ljava/lang/String;")
     public final java.lang.String nonGenericFun() {
         return null;
     }
 
-    @kapt.internal.KaptSignature(value = "<init>()V")
     public GenericRawSignatures() {
         super();
     }
 }
-
-////////////////////
-
-package kapt.internal;
-
-public @interface KaptMetadata {
-
-    public java.lang.String value();
-}
-
-////////////////////
-
-package kapt.internal;
-
-public @interface KaptSignature {
-
-    public java.lang.String value();
-}