RN: Modernize Text Component

Summary:
Rewrites the `Text` component using modern best practices.

Notably, `Text` no longer depends on `Touchable` and now instead depends on `Pressability`.

Changelog:
[Internal]

Reviewed By: mdvacca

Differential Revision: D26106824

fbshipit-source-id: 0797e66075ae03c51dd5b4b3395b21ae92c39ba6