Add commit benchmark

[hoxbro]

I am also adding pytest-xdist to speedup the run.

[codspeed-hq]

CodSpeed Performance Report

Merging #74 will not alter performance

_{Comparing add_commit_benchmark (2da0ce8) with main (61e7811)}

Summary

✅ 3 untouched benchmarks

🆕 3 new benchmarks

Benchmarks breakdown

	Benchmark	main	add_commit_benchmark	Change
🆕	test_commit[100]	N/A	1.8 s	N/A
🆕	test_commit[1000]	N/A	21.8 s	N/A
🆕	test_commit[10]	N/A	188.2 ms	N/A