RegisterMap is a helper for making many calls to RouterGroup.METHOD(...), using a table-driven approach.

MethodAny is a special value to pass for the Method key in a HandlerMap to call RouterGroup.Any instead of RouterGroup.METHOD.

Controller defines the interface for a controller that can register its routes against a (gin) router.

HandlerMap defines a mapping from pairs of (method, path) to a handler function for a route.