feat: allow overriding --version and --help with custom args

[kricsleo]

resolves #145

This PR adds support for overriding --version/--help when a custom version/help argument is defined.

If users define their own version/help argument, the default behavior (logging the version/showing usage) will be skipped, and their custom command will run instead.

This applies to both top-level commands and sub-commands.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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##             main     #196   +/-   ##
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  Coverage        ?   94.15%           
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  Files           ?        7           
  Lines           ?      530           
  Branches        ?      176           
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  Hits            ?      499           
  Misses          ?       31           
  Partials        ?        0           

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