* store sso provider in user metadata
* store user metadata
* store user auth_provider in user metadata
* add "metadata" for LiteLLM_UserTable
* fix sso test
* use /user/list endpoint on admin ui
* sso insert user with role when user does not exist
* add sso sign in test
* linting fix
* rename self serve doc
* add doc for self serve flow
* test - sso sign in default values
* add test for /user/list endpoint