[WIP] Draft autoscheduler

[mtsokol]

WIP

[codspeed-hq]

CodSpeed Performance Report

Merging #831 will degrade performances by 30.19%

_{Comparing ms/draft-autoscheduler (219b11f) with main (ada7871)}

Summary

❌ 1 regressions
✅ 339 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	ms/draft-autoscheduler	Change
❌	test_index_slice[side=100-rank=2-format='gcxs']	2.4 ms	3.4 ms	-30.19%

[hameerabbasi]

I feel we're implementing a lot of IR pass infrastructure which we don't really need -- IMHO it'd be better to define an IR and do it via egglog or MLIR.

[mtsokol]

I think the only part of pass infrastructure rewritten here is rewrite_tools.py taken from Julia Finch. The rest is scheduler logic (passes, IR).
I used egglog for the first try but using pure Python and its structural pattern matching ended up more convenient for me (I could directly map Julia implementation, I can have side-effects inside matches).