[FEAT] OIDC Support

[ww-daniel-mora]

Add support for Open Id Connect
For individuals with many self-hosted services adding support for OIDC would

• Enable them to support single sign on for many sites
• Enable a singe source of users and user management
• More secure hosting of PA with security concerns offloaded to dedicated security services

[ww-daniel-mora]

Potentially helpful examples in python https://curity.io/resources/learn/python-openid-connect-client/

[DreamingRaven]

This would be amazing, there are a plethora of possible clients. One thing I might recommend is since each OIDC provider is not born equal, for the purposes of development it may be a good idea to build around an OIDC connector, like dex which is a common approach and is one of the more popular ones. Then you can use whatever upstream you like from there. I can also add dex to #1340 This way you can also use some other protocols for free like SAML and LDAP since dex will take it from there.