Expose Panel and useLocalStorageState

Summary: Expose a Panel api from Sandy, which is quite similar to the old one, except that it uses Antd, and it will remember the users closed / open preference through sessions, a much requested feature.

Reviewed By: nikoant

Differential Revision: D27966607

fbshipit-source-id: 9b18df377215c1e6c5844d0bf972058c8c574cbb

desktop/flipper-plugin/src/utils/useAssertStableRef.tsx

@@ -15,7 +15,7 @@ import {useRef} from 'react';
  * (intentionally or accidentally)
  */
 export const useAssertStableRef =
-  process.env.NODE_ENV === 'development'
+  process.env.NODE_ENV === 'development' || process.env.NODE_ENV === 'test'
     ? function useAssertStableRef(value: any, prop: string) {
         const ref = useRef(value);
         if (ref.current !== value) {