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Sculpt: Sample Voxel Size

This adds support to the current sculpt sample detail operator to sample
a voxel size for the voxel remesher when sculpting on regular meshes.

It provides an approximation of a voxel size that is going to preserve
the sampled sculpt details after remeshing. It is not going to be 100%
accurate in all cases as it relies on having consistent edge length in
the whole sculpt, but it saves a lot of time and avoids guessing the
voxel size by trying different values.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6251