Create vtk filters for mesh-doctor features

[alexbenedicto]

Following the roadmap of #54 , mesh-doctor needs to have a refactor that would allow the creation of ParaView plugins, as already specified in #16 .

To reach that objective, we first need to create a vtk filter for each mesh-doctor feature, which will then only need a wrapping using VTKPythonAlgorithmBase functionality to be compatible as a ParaView plugin.

To do that, we will apply the same workflow used in geos-posp package and complete the geos-pv package.