Add issue templates for New Architecture (#33832)

Summary:
I'm adding a new Issue Template for New Architecture issues + I've added a contact entry for the Working Group.

## Changelog

[Internal] - Add issue templates for New Architecture

Pull Request resolved: https://github.com/facebook/react-native/pull/33832

Test Plan:
Tested this here
https://github.com/cortinico/react-native/issues/new/choose

Reviewed By: hramos

Differential Revision: D36376737

Pulled By: cortinico

fbshipit-source-id: b8561a7faf0bb99c033686a92bb2d88e443333c2