Investigate using classes and techniques from AbstractHandlerMethodMapping

[spencergibb]

Gateway server webmvc uses a custom invoker package to call methods for predicates and filters when configured via external configuration. It was copied from boots actuator support. This requires that filter and predicates be static methods (which are also used as a DSL).

If we use the classes and techniques from AbstractHandlerMethodMapping, we could have them potentially be beans.

[spencergibb]

Here is the calling side https://github.com/spring-projects/spring-framework/blob/aad742ded049656f655aa777af8fb93f4dbdd2de/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java#L393