Extract cmake functions to create the dependency tree into separate files

Summary

Dependencies to other dune modules in the cmake system are processed by building up a dependency tree by inspecting the dune.module. The a fine_package with the corresponding dune module is called and afterwards versions requirements checked. The functions and macros responsible for this process are extracted into a separate file DuneModuleDependencies.cmake. In upcoming merge requests these functions will be cleaned up and simplified.

Depends on !1030 (merged) and !1027 (merged)

added buildsystem label

mentioned in merge request !1029 (merged)

changed the description

added 19 commits

• 4d7fd0b1...0cf38467 - 18 commits from branch master
• a80249e8 - Extract cmake functions to create the dependency tree into separate files

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enabled an automatic merge when the pipeline for a80249e8 succeeds

merged

mentioned in commit 93147a65

mentioned in merge request !957 (closed)