python bindings for dd glued and CouplingGridView

Dr. Tim Keilrequested to merge
dd_glued_bindings into master

This merge request intends to extend the current bindings code with bindings for the Dune::XT::Grid:DD:Glued class.

For a use case, see this notebook, I will update this notebook from time to time.

Also a CouplingGridView is added which fulfill the Dune::GridView interface for CouplingIntersections from Dune::GridGlue

Edited by Dr. Tim Keil

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