Add a way to consistently document source versions

[matentzn]

I would like to slowly promote adopting a strong provenance model for sources in biolink. This issue is the first in a sequence.

We currently have

https://biolink.github.io/biolink-model/primary_knowledge_source/

which is described using an infores identifier.

I am inclined to keep it that way - this is very useful, and breaking this to be an object instead like:

primary_knowledge_source: {id: infores:123, version: 2024-01-01} would break a lot of good work out there. But I am also not opposed to considering this - I am more interested that the KGX format does not break then the model.

And alternative is a second slot, like primary_knowledge_source_version which is conceptually not so nice as it is disconnected from primary_knowledge_source, but it would do the trick.

Any other ideas?

from @sierra-moxon:

we don't have a standard in place to do this consistently, but we can add one.
check out biolink:DatasetVersion https://biolink.github.io/biolink-model/DatasetVersion/ as a starting point. Probably to do this "right" though, we'd need to link up *knoweldge_source with this object instead or in addition to denormalizing it on the resulting edge itself.
Or we need to disambiguate the use of primary_knowledge_source separate from other kinds of providence metadata (e.g. if we only every use primary_knowledge_source as a shorthand, we don't need to worry about grouping it in an object with other related metadata and instead just add something like, or DatasetVersion itself, in addition to primary_knowledge_source without a formal connection between the two).