feat: Support commands to trigger code review

[wwcchh0123]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 75 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@73183d2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
internal/modes/review_handler.go	0.00%	53 Missing ⚠️
internal/modes/tag_handler.go	0.00%	20 Missing ⚠️
internal/agent/agent.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #329   +/-   ##
=======================================
  Coverage        ?   13.71%           
=======================================
  Files           ?       52           
  Lines           ?    11036           
  Branches        ?        0           
=======================================
  Hits            ?     1514           
  Misses          ?     9377           
  Partials        ?      145           

Flag	Coverage Δ
unittests	13.71% <0.00%> (?)

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