Add *url.URL as an argable type

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.77%. Comparing base (24073e3) to head (f87a72c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/arg/arg.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   87.69%   87.77%   +0.08%     
==========================================
  Files           8        8              
  Lines        1479     1489      +10     
==========================================
+ Hits         1297     1307      +10     
  Misses        121      121              
  Partials       61       61              

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