chore: add marshall benchmark

[bdraco]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.33%. Comparing base (b162494) to head (74927e6).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files          28       28           
  Lines        3325     3325           
  Branches      604      604           
=======================================
  Hits         2771     2771           
  Misses        346      346           
  Partials      208      208           

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[codspeed-hq]

CodSpeed Performance Report

Merging #353 will not alter performance

_{Comparing marshall_benchmark_add (74927e6) with main (b162494)}

Summary

✅ 2 untouched benchmarks
🆕 1 new benchmarks

Benchmarks breakdown

	Benchmark	main	marshall_benchmark_add	Change
🆕	test_marshall_bluez_get_managed_objects_message	N/A	74.4 µs	N/A