Converted QPL plugin to TypeScript

Summary: Converted QPL plugin to TypeScript

Reviewed By: danielbuechele

Differential Revision: D17184095

fbshipit-source-id: 2a841bd8bc746cab70e6a03b0ccc8ffbdbda43c6

src/index.tsx

@@ -16,6 +16,7 @@ export {
   FlipperPlugin,
   FlipperDevicePlugin,
   callClient,
+  Notification,
 } from './plugin';
 export {PluginClient, Props} from './plugin';
 export {default as Client} from './Client';