Add conditional view modifier transformation

[philippzagar]

Add conditional view modifier transformation

♻️ Current situation & Problem

As of now, there's no convenient way to conditionally apply view modifiers to a SwiftUI View.
This feature would be highly useful in order to prevent duplication of code.

⚙️ Release Notes

• Add conditional view modifier transformation via .if(_:, transformation:) and .if(condition:, transformation:)

📚 Documentation

Properly documented added view modifiers with code examples

✅ Testing

Added proper UI tests

📝 Code of Conduct & Contributing Guidelines

By submitting creating 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

All modified and coverable lines are covered by tests ✅

Project coverage is 79.72%. Comparing base (1cf188c) to head (c6c462a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   79.48%   79.72%   +0.24%     
==========================================
  Files          40       41       +1     
  Lines        1228     1242      +14     
==========================================
+ Hits          976      990      +14     
  Misses        252      252              

Files	Coverage Δ
.../SpeziViews/ViewModifier/ConditionalModifier.swift	100.00% <100.00%> (ø)

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[Supereg]

Handy feature. Great to see this implemented. Great documentation as well 🚀