perf: use simdutf8 to validate UTF-8 when reading files

[Boshen]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #237 will not alter performance

_{Comparing simd (4cad9e6) with main (6c4297b)}

Summary

✅ 3 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.88%. Comparing base (6c4297b) to head (4cad9e6).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/file_system.rs	71.42%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   97.04%   96.88%   -0.16%     
==========================================
  Files          11       11              
  Lines        2366     2377      +11     
==========================================
+ Hits         2296     2303       +7     
- Misses         70       74       +4     

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