Refactor SquinToStimPass for clifford dialect + performance

[johnzl-777]

Also included a repetition code - like unit test. I figure this would be nice to have first before working on #498

I believe this should be backportable too which would be great because I'd like to use the flatten pass elsewhere instead of having identical versions floating around (:

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
10802	9422	87%	0%	🟢

New Files

File	Coverage	Status
src/bloqade/stim/passes/flatten.py	100%	🟢
TOTAL	100%	🟢

Modified Files

File	Coverage	Status
src/bloqade/pyqrack/squin/op.py	100%	🟢
src/bloqade/squin/_init_.py	100%	🟢
src/bloqade/squin/_typeinfer.py	100%	🟢
src/bloqade/squin/qubit.py	100%	🟢
src/bloqade/squin/rewrite/U3_to_clifford.py	87%	🟢
src/bloqade/stim/passes/_init_.py	100%	🟢
src/bloqade/stim/passes/simplify_ifs.py	100%	🟢
src/bloqade/stim/passes/squin_to_stim.py	100%	🟢
src/bloqade/stim/rewrite/_init_.py	100%	🟢
src/bloqade/stim/rewrite/ifs_to_stim.py	87%	🟢
src/bloqade/stim/rewrite/qubit_to_stim.py	89%	🟢
src/bloqade/stim/rewrite/squin_measure.py	90%	🟢
src/bloqade/stim/rewrite/squin_noise.py	96%	🟢
src/bloqade/stim/rewrite/util.py	82%	🟢
TOTAL	95%	🟢

updated for commit: 4f71a51 by action🐍

[codecov]

Codecov Report

❌ Patch coverage is 95.40816% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/bloqade/stim/rewrite/qubit_to_stim.py	91.11%	4 Missing ⚠️
src/bloqade/squin/rewrite/U3_to_clifford.py	88.46%	3 Missing ⚠️
src/bloqade/stim/rewrite/squin_noise.py	95.91%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[johnzl-777]

Considering how breaking everything is for #492 I think it's better to just take care of #498 here as well