feat: DiffractionObject algebra operations work between DOs that are on different grids

[sbillinge]

Problem

How do we add DOs that were measured on different grids? It would be nice to be able to do that at least as an option?

Proposed solution

We alrready starting toying around with having a kind of standard array that goes from Q=0 to Q=max-ever (maybe 45 A-1?) on a fine grid. Then we can interpolate anything on to it, padded with nan's. The algebra could appear in hte overlap region only, for example?