[Review #3743] [WeOpen-Star] Add simpler client annotations for shenyu-client-http

[Shawn Jim]

Dear Community:

        I`ve finish add simpler client annotations for shenyu-client-http.

        Please help to review/comment. Thanks for your time!

        ISSUE : https://github.com/apache/shenyu/issues/3805.
        PR : https://github.com/apache/shenyu/pull/3819.

Thanks,
Shawn