chore: add benchmark for sending packets

[bdraco]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (3594988) to head (21f18c9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1471   +/-   ##
=======================================
  Coverage   99.78%   99.78%           
=======================================
  Files          30       30           
  Lines        3311     3311           
  Branches      453      453           
=======================================
  Hits         3304     3304           
  Misses          5        5           
  Partials        2        2           

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[codspeed-hq]

CodSpeed Performance Report

Merging #1471 will not alter performance

_{Comparing bench_send (21f18c9) with master (3594988)}

Summary

✅ 3 untouched benchmarks
🆕 1 new benchmarks

Benchmarks breakdown

	Benchmark	master	bench_send	Change
🆕	test_sending_packets	N/A	52.5 µs	N/A