Summary:
Creates `NativeComponentRegistry` which makes native component initialization more declarative and configurable through an optionally configurable provider.
The next diff converts `ScrollView` to use this new abstraction as a demonstration. The plan would be to use this to replace all current manual call sites of `registerGeneratedViewConfig`, and then the ones generated via the Babel plugin.
Migrating to this will not change any production behavior, but it will enable verification of `ViewConfig` in development.
Changelog:
[Internal]
Reviewed By: JoshuaGross
Differential Revision: D25084468
fbshipit-source-id: 9c758ddc279bf937a401a868a066907a94098f37
Tim Yung