Add flag.FlagSet wrapper

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (58099ab) 89.67% compared to head (cc6badd) 89.86%.

Files	Patch %	Lines
command.go	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   89.67%   89.86%   +0.18%     
==========================================
  Files           2        3       +1     
  Lines         184      217      +33     
==========================================
+ Hits          165      195      +30     
- Misses         12       14       +2     
- Partials        7        8       +1     

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