Summary:
Deletes the `selectionState` prop from `TextInput`.
It does not provide meaningful value over `onBlur`, `onFocus`, and `selectionState`.
Changelog:
[Breaking][TextInput] Removing `selectionState` prop, use `onBlur`, `onFocus`, and `onUpdate` instead.
Reviewed By: zackargyle, TheSavior
Differential Revision: D17879667
fbshipit-source-id: 03a4e239406932adad898d6d2a092e3bc2e6b064