Mutations GraphQL calls

Summary: Added Create, Update, and Delete GraphQL calls (local devdb)

Reviewed By: timur-valiev

Differential Revision: D29472343

fbshipit-source-id: 8fc93da87b90bf8b6cfe24b13bee5c5fe97ab7e3

desktop/app/src/index.tsx

@@ -21,6 +21,7 @@ export {
   internGraphPOSTAPIRequest,
   graphQLQuery,
   isLoggedIn,
+  getUser,
 } from './fb-stubs/user';
 export {FlipperPlugin, FlipperDevicePlugin, BaseAction} from './plugin';
 export {PluginClient, Props} from './plugin';