feat(op): rate limit customized merger

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.69767% with 12 lines in your changes missing coverage. Please review.

Please upload report for BASE (master-v2@1bf084c). Learn more about missing BASE report.

Files	Patch %	Lines
internal/topo/node/rate_limit.go	88.10%	4 Missing and 6 partials ⚠️
internal/topo/planner/planner_source.go	91.30%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master-v2    #2902   +/-   ##
============================================
  Coverage             ?   67.93%           
============================================
  Files                ?      294           
  Lines                ?    28305           
  Branches             ?        0           
============================================
  Hits                 ?    19227           
  Misses               ?     7366           
  Partials             ?     1712           

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