Drawing 3d Voxels

[midstreeeam]

Drawing voxels in 3d space. It is implemented in matplotlib's voxels function.

It draws like this:

It would be very helpful if there is a similar function implemented. When porting code from python to rust, I really hope there are similar functions to use.

I searched and I didn't find plotters has a function relate to voxel. I don't know if I missed it.
If such a function is needed, I'd like to open a PR after I implemented it.