Provide API for `@RestController` Spring Beans

[fabapp2]

What needs to be done

A FindRestControllerBeans finder should find all classes annotated with @RestController and return them as RestControllerBeans offering an API dedicated to @RestControllers.

Why it needs to be done

This API will ease creating Tests for @RestController, introducing Spring Cloud Contract and all sorts of Spring web-related recipes.

Acceptance Criteria

The API should provide all information provided by @RestController or any method annotated with request mapping annotations like @GetMapping or RequestMapping(...)

A RestControllerBean has a set of RestMethod.
RestMethod provides an API to retrieve all information provided through request mapping annotations.

Additional Information

[fabapp2]

Enhance RestControllerSpring Bean support to handle RequestMapping on type level with all supported attributes

The implementation currently only handles @RequestMapping/Get/Post/...Mapping annotations.

Supported at the type level as well as at the method level!

	/**
	 * The HTTP request methods to map to, narrowing the primary mapping:
	 * GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE, TRACE.
	 * <p><b>Supported at the type level as well as at the method level!</b>
	 * When used at the type level, all method-level mappings inherit this
	 * HTTP method restriction.
	 */
	RequestMethod[] method() default {};