Convert TextInput to Hooks

Summary:
Modernizing this code a bit more, converting it to hooks.

Changelog:
[General][Changed] Converted TextInput to use React hooks
[General][Fixed] TextInput now properly sends native the end selection location on change

(Note: this ignores all push blocking failures!)

Reviewed By: JoshuaGross

Differential Revision: D18581712

fbshipit-source-id: 62d6ea8489fa019ddf941c520930365f2c4887d8

Author: elicwhite