[!318] prints warning if likwid is used with instrumentation level 3

Merge branch 'feature/print-likwid-warning' into 'master'

ref:extensions/dune-codegen I've already mentioned this problem in \[!314\]
but I think more visibility for this problem is useful

See merge request [extensions/dune-codegen!318]

  [extensions/dune-codegen!318]: gitlab.dune-project.org/extensions/dune-codegen/merge_requests/318