FEniCS / FEniCS/dolfinx

Improvements to VTKHDF format I/O

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enhancement roadmap
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Description

### Various features can be added to the VTKHDF I/O format:

- [ ] Handling of input markers for cell and boundary data
- [x] Support of higher-order geometry
- [x] Paraview compatibility
- [ ] Function output

* Paraview does not currently support the vtkLagrangePyramid type, which is needed for higher-order visualisation of meshes containing pyramids. See https://gitlab.kitware.com/paraview/paraview/-/issues/22840
* Paraview fails to recognise 2D data for geometry for 2D meshes (probably needs padding to 3D).

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