Support for global authentication

[simonmartyr]

Context

• currently the API leverages a login endpoint tied to the region selected on configuration. However the current mobile application calls a login endpoint which is routed as global
• This endpoint returns a temporary authentication token and a request to verify via 2fa.
• The client then calls - 2fa/generate - with the delivery method
• Followed by the 2fa/verify
• Current login still works - but would not be surprised if it disappears.

Solution

• Implement the three endpoints and likely deprecate the old login.