[ISSUE #8629] Add proxy RocketmqTraffic logger appender to separate traffic logs

[redlsz]

Which Issue(s) This PR Fixes

Fixes #8629

Brief Description

Add RocketmqTraffic appender to rmq.proxy.logback.xml

How Did You Test This Change?

[lizhimins]

@redlsz need rebase develop

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.42%. Comparing base (cab4fda) to head (b357838).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8630      +/-   ##
=============================================
- Coverage      47.52%   47.42%   -0.10%     
+ Complexity     11548    11529      -19     
=============================================
  Files           1279     1279              
  Lines          89558    89558              
  Branches       11514    11514              
=============================================
- Hits           42563    42477      -86     
- Misses         41778    41853      +75     
- Partials        5217     5228      +11     

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[redlsz]

@redlsz need rebase develop

@lizhimins rebase done