Summary:
This is the partial implementation of Fabric-compatible <TextInput> component on iOS. All features are supported besides those:
* `focus()`, `blur()`, `clear()` imperative calls;
* Controlled TextInput as the whole feature in general;
* Controlling selection from JavaScript side;
* `autoFocus` prop;
* KeyboardAccessoryView.
Changelog: [Internal]
Reviewed By: JoshuaGross
Differential Revision: D17400907
fbshipit-source-id: 0ccd0e0923293e5f504d5fae7b7ba9f048f7d259
Valentin Shergin