Add user ratings

Summary:
Adds a star rating to flipper internal.

Based on the nuclide behaviour:
We get an event emitted when a user changes their rating.
And we also get the rating with every ping event, which is fired every minute, if flipper is the primary window.

The only thing I don't like that much is that this doesn't actually say anywhere what the stars are for.

Reviewed By: passy

Differential Revision: D16420281

fbshipit-source-id: 69a52f64058955d7cd068215478e95c554cb9ed4

src/dispatcher/tracking.js

@@ -47,6 +47,8 @@ export default (store: Store, logger: Logger) => {
       clients,
     } = store.getState().connections;
 
+    const {flipperRating} = store.getState().application;
+
     if (!selectedDevice || !selectedPlugin) {
       return;
     }
@@ -70,6 +72,7 @@ export default (store: Store, logger: Logger) => {
       plugin: selectedPlugin,
       app,
       sdkVersion,
+      flipperRating,
     };
 
     // reset dropped frames counter