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 :white_check_mark:

Comparison is base (2bdfab8) 100.00% compared to head (1ecce4f) 100.00%. Report is 1 commits behind head on main.

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[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.