perf: Use branchless uleb128 decoding for parquet

[ritchie46]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.36%. Comparing base (1cdab6f) to head (e3f5dc3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16352      +/-   ##
==========================================
- Coverage   81.37%   81.36%   -0.02%     
==========================================
  Files        1405     1405              
  Lines      183738   183745       +7     
  Branches     2957     2957              
==========================================
- Hits       149525   149511      -14     
- Misses      33700    33721      +21     
  Partials      513      513              

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[codspeed-hq]

CodSpeed Performance Report

Merging #16352 will degrade performances by 17.82%

_{Comparing parquet (e3f5dc3) with main (1cdab6f)}

Summary

❌ 1 regressions
✅ 36 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	parquet	Change
❌	test_groupby_h2oai_q5	8.4 ms	10.2 ms	-17.82%