QR factorization

[nullhook]

Proposed changes

Add QR factorization primitive

TODO:

• [ ] impl for other dtypes
• [ ] tests
• [ ] python bindings

potential tests:

1. reconstruction
2. orthogonality
3. upper triangular

Checklist

Put an x in the boxes that apply.

• [x] I have read the CONTRIBUTING document
• [ ] I have run pre-commit run --all-files to format my code / installed pre-commit prior to committing changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have updated the necessary documentation (if needed)