add save_pvd method to mesh series

Jörg Buchwaldrequested to merge
joergbuchwald/ogstools:save_mesh_series into main

The MR adds a method to allow for saving mesh_series as PVD/VTU.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
  4. API-breaking changes documented here
Edited by Tobias Meisel

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