Openid requests entrypoint, provides additional artifacts to OAuth as stated in Openid Connect Core 1.0.

Note: this module follows inverted heaxagonal architecture, its functions will invoke callbacks of the given module argument and return its result.

The definition of those callbacks are provided by either Backplane.Oauth.Openid.Application or Backplane.Oauth.Openid.JwksApplication and Backplane.Oauth.Openid.UserinfoApplication