feat(windows_foundation): add GuidHelper APIs

[halildurmus]

Description

Related Issue

Type of Change

• ✨ feat -- New feature (non-breaking change which adds functionality)
• 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 refactor -- Code refactor
• ✅ ci -- Build configuration change
• 📝 docs -- Documentation
• 🧪 test -- Test
• 🗑️ chore -- Chore

[codecov]

Codecov Report

Merging #375 (6e4a205) into main (9b79e11) will decrease coverage by 0.02%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
- Coverage   92.96%   92.95%   -0.02%     
==========================================
  Files          85       86       +1     
  Lines        4150     4157       +7     
==========================================
+ Hits         3858     3864       +6     
- Misses        292      293       +1     

Files Changed	Coverage Δ
...ackages/windows_foundation/lib/src/guidhelper.dart	85.71% <85.71%> (ø)

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