[FEAT]: expr simplifier

[universalmind303]

still todo:

• [ ] add a bunch of test cases.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #3393 will degrade performances by 16.73%

_{Comparing universalmind303:expr-simplifier (94cec65) with main (ec39dc0)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 15 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	universalmind303:expr-simplifier	Change
⚡	test_count[1 Small File]	3.8 ms	3.4 ms	+10.18%
❌	test_iter_rows_first_row[100 Small Files]	264.6 ms	317.8 ms	-16.73%