Add capability in GhostPointNeighbors to ghost all point neighbors

[lindsayad]

This includes point neighbors who are elements of different dimension which I believe is not currently captured. This may lead to more expensive logical than what we have currently. We could perhaps default behavior to what is currently in the class and make it an option to ghost all point neighbors

[roystgnr]

Ghosting higher-dimensional point neighbors of lower-dimensional elements should be pretty cheap, enough so that I'd argue we should make it the default. Going the other way around ... that might need to be an optional capability for now.