Introduce Comparator interface (#88016)

* Introduce Comparator interface

* Add compare implementation everywhere

* Add comment explaining what Compare should do

* Lint

pkg/registry/apis/scope/storage.go

@@ -184,3 +184,9 @@ func SelectableScopeNodeFields(obj *scope.ScopeNode) fields.Set {
 		"spec.parentName": parentName,
 	})
 }
+
+// Compare asserts on the equality of objects returned from both stores	(object storage and legacy storage)
+func (s *storage) Compare(storageObj, legacyObj runtime.Object) bool {
+	//TODO: define the comparison logic between a scope returned by the storage and a scope returned by the legacy storage
+	return false
+}