Summary:
Add Native Commands handlers to TextInput.
It is intentionally done in a way so that it can be easily swapped for codegened implementation once we properly type TextInput.
We also add native commands to view managers for backwards compatibility.
Changelog: [Internal]
Reviewed By: TheSavior, shergin
Differential Revision: D19412026
fbshipit-source-id: 8dc64275cf1da599b1bd5992a41035d51dd4148f