BUG #14897: Fix periodic boundary issues with vtkNetCDFCAMReader.

vtkNetCDFCAMReader did not deal with periodicity of the domain correctly. There were cases (as demonstrated by the report BUG) where the cells we incorrectly split. Fixed the code to be more robust to the potential ways in which the points in the cells are defined. Also includes some performance tweaks e.g. using vector instead of map.

This deprecates the SetCellLayerRight/GetCellLayerRight API on the reader. This API is no longer needed since the reader makes an informed decision when deciding which side to place the cells that overlap the periodic boundary.