Enable provider_type during login

[pi0neerpat]

May create too much complexity, so not a high priortiy

• FE: update the login buttons to add all providers, and add the provider type to the /login url
• BE: consume query params for the login endpoint

router.get("/login/keyp", passport.authenticate("oauth2"));

• Modify the passport object authorizationURL, by appending login_provider=<type>, before calling .authenticate()