Honor @skip for subcommands

[jonrebm]

[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review. :warning: Please upload report for BASE (main@2a2a202). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
sphinxarg/ext.py	0.00%	2 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage        ?   46.86%           
=======================================
  Files           ?       12           
  Lines           ?      958           
  Branches        ?      205           
=======================================
  Hits            ?      449           
  Misses          ?      469           
  Partials        ?       40           

Flag	Coverage Δ
unittests	46.86% <0.00%> (?)

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