Add geometry preview filters

ParaView now has 2 new filters named PointSetToOctreeImage and OctreeImageToPointSet.

1. PointSetToOctreeImage can be used to convert a point set to an image with a number of points per cell target and an unsigned char octree cell array. Each bit of the unsigned char indicates if the point-set had a point close to one of the 8 corners of the cell. It can optionally also output a cell array based on an input point array. This array will have 1 or many components that represent different functions i.e. last value, min, max, count, sum, mean.
2. OctreeImageToPointSet can be used to convert an image with an unsigned char octree cell array to a point set. Each bit of the unsigned char indicates if the cell had a point close to one of its 8 corners. It can optionally also output a point array based on an input cell array. This array will have 1 of the components of the input array.

This MR depends on vtk/vtk!9551 (merged).