AuthResultLiveData

Holds current logged-in state of user.

When initiated it will try to resume last logged-in user from persisted session data. It may go through the following states:

1. After init: Success(User) or Failure(NotAuthed.NoLoggedInUser)

2. Auth flow started: Failure(NotAuthed.AuthInProgress)

3. Auth flow completed: Success(User) or Failure(NotAuthed.LoginFailed)

4. Auth flow cancelled: Failure(NotAuthed.CancelledByUser)

5. User logs out: Failure(NotAuthed.NoLoggedInUser)