[draft] Generalize backend conversion functions.

Max Kahntrequested to merge
max.kahnt/dune-functions:feature/toBackend-centralized-and-shared-ptr into master

Collect the local helper lambdas as proper free functions. Make them understand vectors that are wrapped in shared_ptr.

This adds typeutilities for shared_ptr which is the main reason why this MR is tagged as WIP.

Edited by Carsten Gräser

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