Can dubbo support @DubboReference async call and no use return value feature?

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Ask your question here


https://dubbo.apache.org/zh/blog/2018/08/14/dubbo-%E5%85%B3%E4%BA%8E%E5%90%8C%E6%AD%A5/%E5%BC%82%E6%AD%A5%E8%B0%83%E7%94%A8%E7%9A%84%E5%87%A0%E7%A7%8D%E6%96%B9%E5%BC%8F/#consumer-%E9%85%8D%E7%BD%AE

Start by reading the linked Dubbo documentation and the issue's attached image to understand the existing asynchronous-call options. Then trace how @DubboReference calls are handled and determine the expected behavior for an asynchronous invocation whose return value is unused. Done should include a clearly defined supported usage and corresponding validation.

Written by the indexing model from the issue text.