[feature/oauth] Add get_login_data to the auth_provider_interface

PHPBB3-11673
[feature/oauth] Finish updating interface and related code

PHPBB3-11673
[feature/oauth] Fix error caused by previous change in OAuth

PHPBB3-11673
[feature/oauth] OAuth clear tokens on logout

PHPBB3-11673
[feature/oauth] Pass users_table as parameter to OAuth in construct

PHPBB3-11673