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/ui/Tracked.tsx

@@ -57,6 +57,14 @@ export function TrackingScope({
   );
 }
 
+/**
+ * Gives the name of the current scope that is currently rendering.
+ * Typically the current plugin id, but can be further refined by using TrackingScopes
+ */
+export function useCurrentScopeName(): string {
+  return useContext(TrackingScopeContext);
+}
+
 export function Tracked({
   events = 'onClick',
   children,
@@ -73,7 +81,7 @@ export function Tracked({
   action?: string;
   children: React.ReactNode;
 }): React.ReactElement {
-  const scope = useContext(TrackingScopeContext);
+  const scope = useCurrentScopeName();
   return Children.map(children, (child: any) => {
     if (!child || typeof child !== 'object') {
       return child;