Add customizable sex coding to checkParentIDs

[smasongarrison]

Introduced code_male and code_female parameters to checkParentIDs, allowing users to specify custom values for male and female sex coding. Updated documentation and NEWS to reflect this change. Improved handling of missing sex values in checkParentSex.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.40%. Comparing base (fc988b9) to head (d212334).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
R/checkParents.R	60.00%	2 Missing ⚠️
R/checkSex.R	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
- Coverage   84.45%   84.40%   -0.05%     
==========================================
  Files          25       25              
  Lines        3957     3964       +7     
==========================================
+ Hits         3342     3346       +4     
- Misses        615      618       +3     

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