Add a way to track assembly data
Add a way to track assembly data

We have to track the assembly used when we parse hits for import. This
adds a channel to do that. I use an extra channel instead of threading
it through the existing ones to prevent having to rerun this for the
current release.

RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline