Add a sort index to geometry proximity node

Right now the geometry proximity node only computes the closest face, edge or point.

I propose an addition of a sort index, so you can easily get the second, third, fourth etc. closest target.

I don't know how easy this would be to implement, but, as of right now, the easiest way to do this to my understanding is to find the closest point, remove it, then search again, but that won't work if you don't want to remove the point, for example if other sample positions need to be able to target that point.

Thanks for reading.