Conversion to kapitan

This is the initial PR to convert the FNAL config file to the kapitan system. Note that this is done in the temporary fnal_new and cern_new branches. Please compare the changes to the configuration and see if they make sense.

If the changes make sense please approve and merge.

.gitlab/CODEOWNERS

+/compiled/cern/ @ntsipina @mmascher @aperezca
+/compiled/fnal/ @fakhan @lguilher