feat(fdleak): added support for macos (darwin)

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 83.14607% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.31%. Comparing base (1a12044) to head (3483c18).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/fdleak/fdleak_darwin.go	82.97%	6 Missing and 2 partials ⚠️
internal/fdleak/fdleak_linux.go	83.33%	2 Missing and 2 partials ⚠️
internal/fdleak/fdleak_unsupported.go	0.00%	2 Missing ⚠️
internal/assertions/safety.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   91.32%   91.31%   -0.02%     
==========================================
  Files          94       97       +3     
  Lines       12226    12293      +67     
==========================================
+ Hits        11166    11225      +59     
- Misses        839      846       +7     
- Partials      221      222       +1     

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