Add (javax.)Validation Support for functional interface

For Stream binder there for support for the javax validation:
https://github.com/spring-cloud/spring-cloud-stream/commit/d93f170f2e82319300b825c0437523353fc3c590

But it seams for the functional interface it is gone.
It would expect this throwing a error when a message with invalid person name was received instead calling the log() method.

@SpringBootApplication
public class LoggingConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(LoggingConsumerApplication.class, args);
    }

    @Bean
    public Consumer<Message<@Valid Person>> log() {
        return msg -> {
            System.out.println("Received: " + msg.getPayload());
        };
    }

    public static class Person {
        private String name;
        public String getName() {
            return name;
        }
        @Pattern(regexp = "^[a-zA-Z_:][a-zA-Z0-9_:]*$")
        public void setName(String name) {
            this.name = name;
        }
        public String toString() {
            return this.name;
        }
    }
}

Start by comparing the existing javax validation support in the linked Stream binder commit with functional-interface message handling, especially the Consumer<Message<@Valid Person>> example. Add a regression test showing that an invalid Person prevents log() from being invoked and produces a validation error.