chore: use imported b256 types

[mattsse]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #13509 will not alter performance

_{Comparing fix/use-imported-b256 (5d2bcfa) with main (dcdde39)}

Summary

✅ 73 untouched benchmarks
🆕 4 new benchmarks
⁉️ 4 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	fix/use-imported-b256	Change
🆕	range lookup`	N/A	53.7 µs	N/A
🆕	any lookup`	N/A	197 µs	N/A
🆕	`prefix set	preload size: 100	input size: 100	Vec with binary search lookup`
🆕	`prefix set	preload size: 100	input size: 100	Vec with custom cursor lookup`
⁉️	range lookup`	53.5 µs	N/A	N/A
⁉️	any lookup`	192.9 µs	N/A	N/A
⁉️	`prefix set	preload size: 100	input size: 99	Vec with binary search lookup`
⁉️	`prefix set	preload size: 100	input size: 99	Vec with custom cursor lookup`