[KLIB][tests] Reorganize "klib dump-metadata" tests

- Keep the test data under "native/native.tests/testData/klib/" dir
- Rename tests from "klib contents" to "klib dump-metadata"

native/native.tests/testData/klib/dump-metadata/builtinsSerializer/binaryRetainedAnnotation.kt

@@ -0,0 +1,21 @@
+package test
+
+import kotlin.annotation.AnnotationTarget.*
+
+@Retention(AnnotationRetention.BINARY)
+@Target(CLASS, CONSTRUCTOR, FUNCTION, PROPERTY, VALUE_PARAMETER, TYPE, TYPE_PARAMETER)
+annotation class A
+
+@A
+class Klass @A constructor()
+
+@A
+fun <@A T> function(@A param: Unit): @A Unit {}
+
+@A
+val property = Unit
+
+enum class Enum {
+    @A
+    ENTRY
+}