ENG-21552 - Provide ADP as an SSO provider

Check that auth url generation works

#+begin_src python

user = User.objects.get(email='a+ceo@15five.com')

config = ADPConfig.objects.get(company=user.company)

config.get_oauth_authorize_url('02dc38cbfa2b44adab8a66fb007eaaa9')

#+end_src

#+RESULTS: