[BENCHMARK] add span otlp recordable benchmark

[dbarker]

Fixes # (issue)

Changes

• benchmark the OtlpRecordable recording path (Span Start->End) and the export path (populating the OTLP request message).

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.83%. Comparing base (fce6ad6) to head (3768863).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4165      +/-   ##
==========================================
+ Coverage   82.82%   82.83%   +0.02%     
==========================================
  Files         406      406              
  Lines       16913    16913              
==========================================
+ Hits        14007    14009       +2     
+ Misses       2906     2904       -2     

see 1 file with indirect coverage changes

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[lalitb]

thanks.

[marcalff]

LGTM, thanks for the benchmarks.