* Added OAuth2 authorize route response_model
* Changed OAuth2 "authorize" route backend param type.
On OAuth2 router creation, an enum is created for the `authentication_backend` parameter. This allows us to generate OpenAPI docs correctly.
* Reformatted with "make format"
* Updated OAuth2 authorize url docs
- /authorize now returns 422 instead of 400 for an invalid authentication backend
* Names for urls added
* Tests for Login/Logout Names
* Register Name Test
* tests/test_router_reset.py
* Tests to verify url names in users router
* Test Verify Router Names
* oauth routes updated with prefix
* Test for authorize. Didn't right test for callback as covered under other tests
* Use UUID for user id and oauth account id
* Update documentation for UUID
* Tweak GUID definition of SQLAlchemy to match Tortoise ORM one
* Write migration doc
* Move users router in sub-module
* Factorize UserRouter into EventHandlersRouter
* Implement OAuth registration/login router
* Apply isort/black
* Remove temporary pytest marker
* Fix httpx-oauth version in lock file
* Ensure ON_AFTER_REGISTER event is triggered on OAuth registration
* Add API on FastAPIUsers to generate an OAuth router
* Improve test coverage of FastAPIUsers
* Small fixes
* Write the OAuth documentation
* Fix SQL unit-tests by avoiding collisions in SQLite db files
