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

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

@@ -1,3 +1,4 @@
+package test {
     @JustString(string = "kotlin") @StringArray(stringArray = {}) class C1 constructor()
     @StringArray(stringArray = {"java", ""}) class C2 constructor()
     annotation class JustString constructor(string: String) : Annotation {
@@ -5,4 +6,5 @@
     }
     annotation class StringArray constructor(stringArray: Array<String>) : Annotation {
         val stringArray: Array<String>
-    }
+    }
+}