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

native/native.tests/testData/klib/dump-metadata/builtinsSerializer/annotatedEnumEntry.txt

@@ -1,3 +1,4 @@
+package test {
     annotation class Anno constructor(value: String = ..., x: Int = ...) : Annotation {
         val value: String
         val x: Int
@@ -8,4 +9,5 @@
         enum entry Entry2
         @Anno(value = "3") @Bnno enum entry Entry3
         @Anno(value = "4", x = 4) enum entry Entry4
-    }
+    }
+}