Add setup to benchmark

[hoxbro]

Because we "empty" the annotator when running define_annoator / commit, we never really measured the time it took to run the critical part of the code.

[codspeed-hq]

CodSpeed Performance Report

Merging #80 will degrade performances by 99.94%

_{Comparing benchmark_database3 (b89790c) with main (db4f638)}

Summary

❌ 6 (👁 6) regressions

Benchmarks breakdown

	Benchmark	main	benchmark_database3	Change
👁	test_commit[1000]	8.5 ms	13,452 ms	-99.94%
👁	test_commit[100]	1.3 ms	1,211.4 ms	-99.89%
👁	test_define_annotations[100]	51.2 ms	131.9 ms	-61.19%
👁	test_commit[10]	562.2 µs	206,607.9 µs	-99.73%
👁	test_define_annotations[10]	8.5 ms	89.8 ms	-90.54%
👁	test_define_annotations[1000]	482.3 ms	566.9 ms	-14.92%