Improve error messages issued upon failure of CLI argument type validation

[robomics]

Closes #78.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 71.48%. Comparing base (e40619a) to head (e819080).
Report is 167 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stripepy/cli/setup.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   71.48%   71.48%           
=======================================
  Files          18       18           
  Lines        2108     2108           
=======================================
  Hits         1507     1507           
  Misses        601      601           

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