nl: add a benchmark

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[codspeed-hq]

CodSpeed Performance Report

Merging #8808 will not alter performance

_{Comparing sylvestre:bench-nl (bf8b12e) with main (be25344)¹}

Summary

✅ 69 untouched
🆕 8 new
⏩ 73 skipped²

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
🆕	cp_archive_balanced_tree[(5, 4, 10)]	N/A	79.7 ms	N/A
🆕	cp_large_file[16]	N/A	294 µs	N/A
🆕	cp_preserve_metadata[(5, 4, 10)]	N/A	77 ms	N/A
🆕	cp_recursive_balanced_tree[(5, 4, 10)]	N/A	74.5 ms	N/A
🆕	cp_recursive_deep_tree[(120, 4)]	N/A	13.7 ms	N/A
🆕	cp_recursive_wide_tree[(6000, 800)]	N/A	192.8 ms	N/A
🆕	nl_large_file[10]	N/A	128.1 ms	N/A
🆕	nl_many_lines[100000]	N/A	101.6 ms	N/A

Footnotes

1. No successful run was found on main (1331ff1) during the generation of this report, so be25344 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 73 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)