Summary:
This adds a synchronous method that JS can call to load view managers.
Notably, we don't have an exact way to go from a JS name to the native view manager, so this naively adds 'Manager' to the end.
After lazily loading the view, it makes sure to cache all its values in native and JS, as further calls from JS will fail.
Reviewed By: PeteTheHeat
Differential Revision: D10204314
fbshipit-source-id: ebf42a85dcc467f3b4c5d6e18e49e04f9e8aa4f9
751be26015