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/__tests__/api.node.tsx

@@ -38,6 +38,7 @@ test('Correct top level API exposed', () => {
       "Layout",
       "MarkerTimeline",
       "NUX",
+      "Panel",
       "TestUtils",
       "Tracked",
       "TrackingScope",
@@ -49,6 +50,7 @@ test('Correct top level API exposed', () => {
       "sleep",
       "styled",
       "theme",
+      "useLocalStorageState",
       "useLogger",
       "useMemoize",
       "usePlugin",