hadamard_utils.py License Provenance

[qti-kromero]

https://github.com/Cornell-RelaxML/quip-sharp/blob/main/lib/utils/matmul_had.py

I believe the above attribution, based on GPLv3 license, would cause this file to inherit this GPLv3 license which is not fully being bubbled up to the top-level license for the QuaRot package