CAO: leverage policy config for oauth-server

🏆 What

Let the Cluster Authentication Operator deliver the policy to OAuthServer.

💖 Why

In order to know if authn events should be logged, OAuthServer needs to be aware of it.

🗒 Notes

Create an observer to deliver the audit policy to the oauth server

Make the authentication-operator react to the new audit field in the oauth.config/cluster object. Write an observer watching this field, such an observer will translate the top-level configuration into oauth-server config and add it to the rest of the observed config.