WIP: Support vtk output of multidomain grid views

What does this MR do?

Allows the vtkSolutionVTKWriter to write solutions on a subdomain of the grid view used for the grid function space. The main trick here is to explicitly store the grid view on the common data, together with a transformation from the subdomain to main domain.

Is there something that needs to be double checked?

• That the merge request core/dune-common!696 (merged) is already accepted
• How could I test this without having to add the dune-multidomaingrid dependency.

Can this MR be accepted?

• Implemented
• MR of Std::identity in dune-common is accepted
• Added test
• Pipeline passing
• Added entry to CHANGELOG.md

Related issues

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resolved all threads

added 2 commits

• fe477348 - Cache entity and use entity set index set in vtk solution output
• cdc06062 - Remove unused variables in recipes

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• 1ed45868 - Fix templated constructor & fit grid function interface

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marked the checklist item MR of Std::identity in dune-common is accepted as completed

resolved all threads

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• 624ef371 - Apply suggestion to dune/pdelab/gridfunctionspace/vtk.hh

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resolved all threads

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• 6d17aa1d - Apply suggestion to dune/pdelab/gridfunctionspace/vtk.hh

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@santiago.ospina What is the state of this merge request?

This MR is too old and sub-spaces do the trick nicely: https://gitlab.dune-project.org/pdelab/dune-pdelab/-/blob/master/dune/pdelab/test/testpoisson-multidomain.cc#L332

closed

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