Introduce ReactNativeFeatureFlags file to control FeatureFlags in React Native

Summary:
introduce ReactNativeFeatureFlags file to control FeatureFlags in React Native

changelog: [JS][Added] Create new API to configure FeatureFlags in ReactNative

Reviewed By: JoshuaGross

Differential Revision: D34349458

fbshipit-source-id: 73bb3704fc47e950ee1fcefcfaec1a85dfbcef59

Author: mdvacca

Libraries/ReactNative/ReactNativeFeatureFlags.js

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+export type FeatureFlags = {|
+  isLayoutAnimationEnabled: () => boolean,
+|};
+
+const ReactNativeFeatureFlags: FeatureFlags = {
+  isLayoutAnimationEnabled: () => true,
+};
+
+module.exports = ReactNativeFeatureFlags;