Fix: ETW span ownership lifetime

[fmutlu68]

Fixes #3849

Changes

• Hold shared ownership of the ETW tracer in Span to prevent dangling references
• Update span creation to pass shared ownership
• Testing: ./ci/do_ci.sh cmake.c++17.test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.10%. Comparing base (3057616) to head (1f76b52).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4070   +/-   ##
=======================================
  Coverage   82.10%   82.10%           
=======================================
  Files         385      385           
  Lines       15989    15989           
=======================================
  Hits        13126    13126           
  Misses       2863     2863           

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[fmutlu68]

Could you please have a look here ? also @ThomsonTan It passes all tests