improve min/maxValue extraction

[lukaskollmer]

improve min/maxValue extraction

♻️ Current situation & Problem

the minValue and maxValue hadling currently only looks at integer values, even for decimal numeric questions.

this PR fixes this, and also makes the code a little nicer along the way

⚙️ Release Notes

• min and max values for decimal questions are now properly handled

📚 Documentation

n/a

✅ Testing

n/a

Code of Conduct & Contributing Guidelines

By creating and submitting this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.72%. Comparing base (c076643) to head (bcb1671).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...earchKitOnFHIR/FHIRExtensions/FHIRExtensions.swift	85.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   82.80%   85.72%   +2.92%     
==========================================
  Files          28       28              
  Lines         372      378       +6     
==========================================
+ Hits          308      324      +16     
+ Misses         64       54      -10     

Files with missing lines	Coverage Δ
...esearchKitOnFHIRTests/FHIRToResearchKitTests.swift	100.00% <100.00%> (ø)
...earchKitOnFHIR/FHIRExtensions/FHIRExtensions.swift	68.75% <85.72%> (+8.04%)	⬆️

... and 3 files with indirect coverage changes

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[PSchmiedmayer]

Looks solid, thank you for all the work here 🚀