perf: Benchmarks for OTLP conversion

[cijothomas]

Mostly to get a baseline of where is time being spent. That should help guide future perf optimizations.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (31b61fe) to head (3d7bca4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3307     +/-   ##
=======================================
- Coverage   82.2%   82.2%   -0.1%     
=======================================
  Files        128     128             
  Lines      24506   24506             
=======================================
- Hits       20151   20150      -1     
- Misses      4355    4356      +1     

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