importing ansys.tools.visualization loads vtk libraries

[koubaa]

simply importing the visualization library will load vtk, which is not the case for pyvista. I have a workaround in pymapdl here:
ansys/pymapdl#3887

This is problematic because in situations when pyvista is installed but is never used, the import of ansys.tools.visualization loads dozens of libraries into the process. I have a bug that when libvtkIOEnSight.so is loaded into the mapdl process on a linux machine that uses an AMD CPU, MAPDL crashes. I don't know why it crashes yet, but this is why I worked around the issue.

Ideally, a side effect of loading the visualization interface library, especially when other backends are supported, would not force-load all vtk libraries into the process.