Update FindAlberta and cleanup cmake module

Simon Praetoriusrequested to merge
simon.praetorius/dune-grid:feature/find_alberta_cleanup into master

Summary

Improve implementation of FindAlberta, by introducing imported targets. Additionally some unused parameter are removed from the FindAlberta cmake file: OBJECT, SOURCE_ONLY, USE_GENERIC, and GRIDDIM. Thereby, the GRIDDIM parameter is still parsed for backwards compatibility and just sets the WORLDDIM.

Edited by Simon Praetorius

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