title: Is it possible to add custom method type to protobuf service?
body: <p>When you describe service with protobuf, you can add rpc methods. Is it possible to write some extension to use custom method type like:</p>
  
  <pre><code>service SomeService {
      rpc SomeRPCMethod(Request) returns (Response);
      amqp SomeAMQPMethod(AMQPRequest);
  }
  </code></pre>
  
  <p>I found some information according to extending methods and service options but nothing about custom method types.</p>