inherit from vtkUnstructuredGridReader replace RequestData

I am working on porting a legacy reader to vtk 9.1 that inherits from vtkUnstructuredGridReader.

This commit Kitware/VTK@e9bc920 removed RequestData and appears to be replaced by ReadMeshSimple

I can’t seem to find an example that indicates how I should modify the class.

maybe the class needs to use some lower level class? or What is the correct approach to replacing RequestData with ReadMeshSimple