Add support for Apple TV (tvMLJS)

[bhagyas]

This is a high-level issue to track support for Apple TV.

As outlined in https://developer.apple.com/documentation/tvmljs

[idmitriev]

react-native now supports tvOS and there is a pull request for Android TV support. To make this work with browser-based TV platforms(Tizen, webOS, etc) we need to use platform-agnostic elements as View, Text, Image and not DOM elements like h2, div, etc.

[raphamorim]

I think it's a valid idea (if based on tvml.js), worth to track. But for now the idea of ReactTVRenderer is know only (for now) web [DOM and Canvas] to run on browser-based TVs.

However, good to track: https://github.com/emadalam/atvjs

I think it's a discussion for next react-tv releases.