Create custom formatter to support calling back a mobile deep link

[ekryski]

OAuth is cumbersome on React Native. What we should be able to do is bounce out to the native browser (rather than use an embedded webview), go through the OAuth flow, and then callback with a mobile app scheme URL.

This can be accomplished in a similar manner to #6 by allowing the developer to register a custom formatter with the deep link.

• See this stackoverflow post
• Possibly borrow some code from here.

We would then return the HTML response with JS that calls back the mobile deep link with the JWT accessToken. Making mobile auth great again! 🌟