Feature os_signpost

[zenangst]

• Feature os_signpost
• Add optimization based on os_signpost results

[codecov-io]

Codecov Report

Merging #203 into master will decrease coverage by 1.85%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   81.45%   79.60%   -1.86%     
==========================================
  Files          11       12       +1     
  Lines         836      863      +27     
==========================================
+ Hits          681      687       +6     
- Misses        155      176      +21     

Flag	Coverage Δ
iOS	70.86% <22.22%> (-13.14%)	⬇️
macOS	77.63% <0.00%> (-2.51%)	⬇️
tvOS	33.85% <0.00%> (-9.15%)	⬇️

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Impacted Files	Coverage Δ
Sources/Shared/OSSignpostController.swift	22.22% <22.22%> (ø)

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