chore: add fmt benches

[DaniPopes]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #487 will not alter performance

_{Comparing DaniPopes:fmt-benches (a97e5ab) with main (c7f7285)}

🎉 Hooray! codspeed-rust just leveled up to 3.0.2!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 253 untouched benchmarks
🆕 42 new benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
🆕	base_convert/128/128/10/be	N/A	13.9 ms	N/A
🆕	base_convert/128/128/10/le	N/A	3.5 ms	N/A
🆕	base_convert/192/192/10/be	N/A	22.5 ms	N/A
🆕	base_convert/192/192/10/le	N/A	9.4 ms	N/A
🆕	base_convert/256/256/10/be	N/A	33.6 ms	N/A
🆕	base_convert/256/256/10/le	N/A	18.4 ms	N/A
🆕	base_convert/384/384/10/be	N/A	65 ms	N/A
🆕	base_convert/384/384/10/le	N/A	47.6 ms	N/A
🆕	base_convert/4096/4096/10/be	N/A	132.7 ms	N/A
🆕	base_convert/4096/4096/10/le	N/A	129.6 ms	N/A
🆕	base_convert/512/512/10/be	N/A	110.1 ms	N/A
🆕	base_convert/512/512/10/le	N/A	91.7 ms	N/A
🆕	base_convert/64/64/10/be	N/A	8.3 ms	N/A
🆕	base_convert/64/64/10/le	N/A	615.7 µs	N/A
🆕	fmt/binary/128	N/A	8.7 ms	N/A
🆕	fmt/binary/192	N/A	12.5 ms	N/A
🆕	fmt/binary/256	N/A	17.6 ms	N/A
🆕	fmt/binary/384	N/A	25.8 ms	N/A
🆕	fmt/binary/4096	N/A	9.2 ms	N/A
🆕	fmt/binary/512	N/A	37.2 ms	N/A
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

[DaniPopes]

They run instantly in codspeed but maybe they're too many? wdyt @Rjected @prestwich

[prestwich]

I think that having 180 benches just for base conversion and formatting is probably overkill and likely to create some noise. i'd prefer to cut that down a bit. Conversion is a 1-time cost and can be amortized in program life-cycle, and not the perf focus of the lib. let's have the majority of the benches focus on the math and allocations of using the uints

[DaniPopes]

how about now?