Summary:
This is the second step in creating a new DevSupportManager impl with more async-friendly APIs for bundle loading, which I'll use in bridgeless mode. This diff creates a new interface, AsyncDevSupportManager, and two implementations, mirroring what we currently have.
This new interface doesn't define any methods yet.
Changelog: [Android][Changed] Specify DevSupportManager.setPackagerLocationCustomizer in DevSupportManager impls
Reviewed By: mdvacca
Differential Revision: D19870812
fbshipit-source-id: 042a43e1a3055aba6d7325f948060300b5bf17f3