Support proxy to get consumer connection list

[lyx2000]

Make sure set the target branch to develop

What is the purpose of the change

fix #6294

Brief changelog

add GET_CONSUMER_CONNECTION_LIST to proxy

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 43.13%. Comparing base (9e0fb1b) to head (89f241c).
Report is 843 commits behind head on develop.

Files with missing lines	Patch %	Lines
...oxy/remoting/activity/ConsumerManagerActivity.java	0.00%	28 Missing ⚠️
...ocketmq/proxy/remoting/RemotingProtocolServer.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #6296      +/-   ##
=============================================
+ Coverage      43.12%   43.13%   +0.01%     
- Complexity      8847     8854       +7     
=============================================
  Files           1095     1094       -1     
  Lines          77279    77278       -1     
  Branches       10082    10084       +2     
=============================================
+ Hits           33324    33337      +13     
+ Misses         39782    39769      -13     
+ Partials        4173     4172       -1     

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[xdkxlk]

LGTM