* Refactor all auth adapters to reduce duplications
* Adds mocking and proper testing for all auth adapters
* Proper testing of the google auth adapter
* noit
* Integrate auth adapter for Facebook accountkit login
* Also verify Facebook app id associated with account kit login
* Add appsecret_proof as extra graph request parameter
* Specific error message for Account kit and more test coverage
* One more test to cover when AppIds for Facebook account kit not configured properly