shared thread pool task and completing logic of rpc client task for community

["邪龙(dragon-zhang)" <19...@qq.com.INVALID>]

Dear community:


I create some tasks for the community.


In ISSUE[1], we discussed and think that we should add the logic of annotation on the splicing class for all rpc shenyu client, but this is a lot of work and `incubator-shenyu`  need your help, check TASK[2] for more details.


TASK[3] is a subtask of ISSUE[4], now the sofa plugin and tars plugin do not use the shared thread pool, you need to support it.



ISSUE[5] is a bug in our website, the document uses English incorrectly.



If you want to contribute, please leave a message to TASK[2], TASK[3] or ISSUE[5]  and I will assign it to you.


Looking forward to your reply.
dragon-zhang


[1] https://github.com/apache/incubator-shenyu/issues/3317

[2] https://github.com/apache/incubator-shenyu/issues/3407

[3] https://github.com/apache/incubator-shenyu/issues/3406
[4] https://github.com/apache/incubator-shenyu/issues/3026
[5] https://github.com/apache/incubator-shenyu-website/issues/569