Enable OAuth2LoginManager for Authorization Code Flow:

[this-Aditya]

Currently, pRMT utilizes ManagementPortalLoginManager for authentication and authorization.
There is an existing plugin dedicated to handling OAuth flows. Therefore, there should be an option to choose between ManagementPortalLoginManager for the existing flow and OAuth2LoginManager for the new authorization code flow.

[yatharthranjan]

See this related issue - https://github.com/RADAR-base/hydra-kratos/issues/53. We will still need to scan the QR code to get info about the auth server urls