Schema evolution check script does not detect changes in non-members

[tmadlener]

The current version of the script that checks for impossible schema changes does not detect changes to VectorMembers, OneToOneRelations and OneToManyRelations. Instead it just let's schemas with these changes pass without warning or error. The schema evolution mechanism can in principle handle these, but will need some manual intervention obviously. As a first step, we should at least detect these changes and mark them as impossible, instead of letting users run into runtime issues when doing changes like these and trying to read old files.

[tmadlener]

This would be necessary to e.g. handle key4hep/EDM4hep#382