Merge pull request #16323 from mschreter/rpe_additional_data

RemotePointEvaluation: add AdditionalData struct

diff --cc include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
Simple merge

diff --cc tests/remote_point_evaluation/mapping_01.cc
Simple merge

diff --cc tests/remote_point_evaluation/mapping_03.cc
Simple merge

diff --cc tests/remote_point_evaluation/mapping_04.cc
Simple merge