feat: added open source toolchain preference option for xcode

[soumyamahunt]

resolves #369

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.96%. Comparing base (a861e37) to head (32528b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #371      +/-   ##
==========================================
+ Coverage   92.94%   92.96%   +0.01%     
==========================================
  Files          34       34              
  Lines        1106     1109       +3     
  Branches      152      153       +1     
==========================================
+ Hits         1028     1031       +3     
  Misses         78       78              

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