[keycloak-dev] Refactoring to OIDCLoginProtocolService due to single endpoints for authorization and token

[Stian Thorgersen]

OIDCLoginProtocolService was becoming very bloated, especially once I added single for authorization and token endpoints. So I've extracted the logic into a few sub-resources:

* AuthorizationEndpoint - login + registration
* LoginStatusIframeEndpoint
* LogoutEndpoint
* TokenEndpoint
* UserInfoEndpoint
* ValidateTokenEndpoint

I've not committed it yet as I need to do a bit more testing first, but wanted to give everyone a heads up.

If anyone wants to review it before I commit have a look at https://github.com/stianst/keycloak/tree/oidc