perf: Use `memchr` for byte search

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (671e93b) 85.54% compared to head (f3a704b) 85.63%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #288 +/- ## ========================================== + Coverage 85.54% 85.63% +0.09% ========================================== Files 18 18 Lines 1736 1740 +4 ========================================== + Hits 1485 1490 +5 + Misses 251 250 -1 ```

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #288 will not alter performance

_{Comparing dd/memchr-again (f3a704b) with master (671e93b)}

Summary

✅ 6 untouched benchmarks