Permanent identifiers for data and model catalog entries

[acocac]

I propose to explore permanent identifiers for model/data entries. Not sure if this feature exists in pandas or pydantic, but the w3id initiative seems to provide a simple way to generate them.

The naming policy in w3id is to claim a top-level directory name and add project specific second level identifiers. For instance, https://w3id.org/PROJECT-ID/SUB-ID.... We can use SUB-ID as an additional key/column for each model/data entry. This might replace the manual identifiers data-00x or model-00x which are not optimal in the long term.