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
f7875002dd