Middleware: JWT Auth

[andrewmclagan]

Authentication middleware as seperate packages would enable handy features:

https://wordpress.org/plugins/jwt-authentication-for-wp-rest-api/

JWT support would be incredibly useful

[andrewmclagan]

Currently progressing into a plugin implementing a full oAuth 2.0 implementation of password-grant type.

https://github.com/wp-headless/authentication

WIP