Some providers need additional information after the standard DISCOVERY_PATH = ".well-known/openid-configuration" for the discovery url to work correctly

Example, Azure:
https://login.microsoftonline.com/xxxxxxxx-xxxx-xxxx-xxxx-xxtenantid/v2.0/.well-known/openid-configuration?appid=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxappid

The suggested solution is to allow the whole provider-url in the oidc.json entry "provider-url" and to take the url as is if it already contains the DISCOVERY_PATH = ".well-known/openid-configuration";

This wouldn't change the behaviour of current configuration and allow more flexibility for special cases