Track the source artifact identity in tiledbsoma

[falexwolf]

I was just reviewing the tiledbsoma guide and noticed that it'd be very hard to reconstruct the lineage in particular of this AnnData that's appended here:

But in general, while the run_uid allows to go back to the generating run for every row in the store, if a run appends 100 AnnDatas, it's complicated to know which AnnData ends up there.

Hence, two suggestions:

1. We encourage users to append AnnData-like artifacts rather than AnnData objects to a store
2. In addition to the lamin_run_uid, we also store a lamin_source_artifact_uid column