Spring Security Support @ClientRegistrationId at Class Level

So that users do not need to repeat the annotation for every method, we should support adding @ClientRegistrationId at the class level.

HINT If not found on the method, we should check the interface that declares the method https://github.com/spring-projects/spring-security/blob/36f1de945f229b66080025c81353173db12da92e/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/client/ClientRegistrationIdProcessor.java#L43

cc @joshlong

Comment From: bbudano

Hi @rwinch , I'd like to work on this enhancement.

Comment From: rwinch

Thank you @bbudano! I've assigned the issue to you and will await your PR.