Support OIDC - OpenID Connect

[StefanSchubert]

Is your feature request related to a problem? Please describe.
Creating another new account might be an obstacle for new users to give Sabi a try. Also it increases the security for users, if they
can authenticate via OpenID Connect with one of the big three ID providers (apple, microsoft, google).

Describe the solution you'd like
The registration screen offers to login via apple, google or microsoft ID as well. The Captcha process will be obsolete for those cases.

Describe alternatives you've considered
None.

Additional context
As far as I understand, the application needs to be registered with the ID-Providers. If so, are they willing to do so if Sabi is only reachable via the IPV6 internet?