Use New JSX Transform on React Native

[kuasha420]

Thanks for merging the previous PR. After testing out that PR a bit more I came across some DX issues and tried to fix those in this PR. This PR consists of the following:

1. Removed React from the scope of all template files (To silence VSCode/TS Unused Variable warnings).
2. Updated React Native Configs and Babel Config to use new JSX transform (No React is no defined error caused by Step 1).
3. Added fix for '__DEV__' is not defined #3 __DEV__ is not defined using my proposed solution.
4. Removed inline styles from template.

This will ensure much better DX for using this package. We can revisit some of this after RN0.64 hits stable. Until then, I think this is all that's can be done.

@RichardLindhout What are your thoughts?