Disallow required optional arguments in mutually exclusive groups

[kkarbowiak]

Fixes #188.

[sonarqubecloud]

Quality Gate failed

Failed conditions
E Reliability Rating on New Code (required ≥ A)

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (5341fc7) to head (9c8a910).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   97.42%   97.43%   +0.01%     
==========================================
  Files           1        1              
  Lines         738      741       +3     
==========================================
+ Hits          719      722       +3     
  Misses         19       19              

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