InterpolationRegridder does not support columns

Right now, we only support spherical spaces, but it should be straightfoward to generalized to column ones. In this case, we might need to add extra information to fix the point in space.

Start by locating the InterpolationRegridder implementation and the existing handling for spherical spaces. Trace how spatial points are represented, then determine what information column spaces require. Done means column spaces are supported alongside spherical spaces, with tests or examples demonstrating the generalized behavior.

Written by the indexing model from the issue text.