Access Tokens are not necessarily JWTs. We also don't
have to validate them as we only pass it on as an opaque
string.
This also means that we don't log the JTI access tokens
anymore.
We also simplify handling of oidc callbacks.
There's a bunch of changes here, but in essence:
- split out openid configuration
- separate openid configuration between client/rp and provider
- consolidate client and provider related code in separate packages
These changes allow for simplification of the Handler, as well as a
bunch of test/mock code as the configuration is now instantiated
seperately from the client/provider code.
