refactor: rename vis_cpu to matvis

[piyanatk]

This PR rename vis_cpu to matvis following the consensus from the paper. It will also require refactoring in hera_sim

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All modified and coverable lines are covered by tests ✅

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- Hits           567       566    -1     

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[steven-murray]

Thanks @piyanatk. This all looks good. My only comment is that I think we should split the methods at the module level, rather than the function-name level. I think this is better because it allows us to easily swap in different methods by just adding a new module. It is more along the lines of how other "drop-in replacement" libraries work (e.g. jax.numpy etc).

[steven-murray]

I think the GPU tests are failing either because the enterprise server is still down, or because it doesn't have this GLIBC library. I think we need @mkolopanis help on that.

[steven-murray]

Thanks @piyanatk !