CreateSharedPoints: Need to check if gaps actually exist in the data

I generated some image data using this io benchmark code and started running into issues with CreateSharedPoints enabled. There are no gaps in this data, so CreateSharedPoints needs to be turned off. I can work around this by manually turning it off in ParaView, but in general, I don't think a user really needs to be concerned with turning on or off that property. If it's turned on, Fides should check the block dimensions to see if there is indeed a gap. If not, then it can set CreateSharedPoints to false.