Add benchmark for slicing datasets

[SolarDrew]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #394 will not alter performance

_{Comparing SolarDrew:benchmarking (78283c3) with main (b56cc10)}

Summary

✅ 7 untouched benchmarks

🆕 2 new benchmarks

Benchmarks breakdown

	Benchmark	main	SolarDrew:benchmarking	Change
🆕	test_dataset_compute_data_full_files	N/A	1.9 s	N/A
🆕	test_dataset_compute_data_partial_files	N/A	1.6 s	N/A

[Cadair]

@SolarDrew you have conflicts. I am working on the sample data thing now.

[Cadair]

Needs sample data