Summary:
Adds the package name (Android) / bundle ID (iOS) as a new URL parameter named `app` in the bundle URL. This currently has no effect on Metro, which will ignore it for bundling / caching purposes.
Changelog: [General] - Add package name / bundle ID to bundle URL in development
Reviewed By: cpojer
Differential Revision: D21429764
fbshipit-source-id: 394fe50dba72219f7594ebeac9486a8264a836a6