Add swift-log support for OpenGestures

[Kyle-Ye]

Summary

• add conditional swift-log dependency and OPENGESTURES_SWIFT_LOG manifest flag
• provide Logger compatibility shims for Linux/non-os logging
• route UpdateTracer component update logging through Log.componentUpdates when swift-log is enabled

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.34%. Comparing base (ca341db) to head (e2d335a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #18   +/-   ##
=======================================
  Coverage   74.34%   74.34%           
=======================================
  Files          84       84           
  Lines        2651     2651           
=======================================
  Hits         1971     1971           
  Misses        680      680           

Flag	Coverage Δ
ios	66.75% <ø> (ø)
macos	74.57% <ø> (ø)

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