[KLIB tool] Migrate 'dump-metadata' tests to K/N test infra

native/native.tests/testData/klib/dump-metadata/builtinsSerializer/annotationArguments/varargs.txt

@@ -1,3 +1,4 @@
+package test {
     enum class My private constructor() : Enum<My> {
         enum entry ALPHA
         enum entry BETA
@@ -6,4 +7,5 @@
     annotation class ann constructor(vararg m: My) : Annotation {
         val m: Array<out My>
     }
-    @ann(m = {My.ALPHA, My.BETA}) annotation class annotated constructor() : Annotation
+    @ann(m = {My.ALPHA, My.BETA}) annotation class annotated constructor() : Annotation
+}