review incubator-shenyu-client-golang #6 pr

[Lisandro]

Dear community:

 The  incubator-shenyu-client-golang has new  pr,please review the code.Here is 
this pr main function:1.Add Http register metadata.2.Add go package 
management.Here is link   
https://github.com/apache/incubator-shenyu-client-golang/pull/6/files