NSStackView.addArrangedSubviews and NSStackView.removeArrangedSubviews

[RomanPodymov]

🚀
Hello.
Thank you for SwifterSwift.
Fixed #1180.

Checklist

• I checked the Contributing Guidelines before creating this request.
• New extensions are written in Swift 5.6.
• New extensions support iOS 12.0+ / tvOS 12.0+ / macOS 10.13+ / watchOS 4.0+, or use @available if not.
• I have added tests for new extensions, and they passed.
• All extensions have a clear comments explaining their functionality, all parameters and return type in English.
• All extensions are declared as public.
• I have added a changelog entry describing my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 93.13%. Comparing base (ca24eef) to head (03864d1).

Files	Patch %	Lines
...es/SwifterSwift/AppKit/NSStackViewExtensions.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1181      +/-   ##
==========================================
- Coverage   93.27%   93.13%   -0.15%     
==========================================
  Files         107      108       +1     
  Lines        3969     3975       +6     
==========================================
  Hits         3702     3702              
- Misses        267      273       +6     

Flag	Coverage Δ
ios	95.60% <ø> (ø)
macos	83.18% <0.00%> (-0.20%)	⬇️
tvos	96.17% <ø> (ø)

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