As part of the gen3 refcat work in DM-29543 we intend to do refcat ingestion by running it in three stages:

• Convert external refcat to Rubin format (this can take a long time)
• Create the dataset type corresponding to the refcat (currently these dataset types are unique per refcat)
• Run butler ingest-files

To make this work we need to be able to easily create a new dataset type from the command line. Something like:

$ butler register-dataset-type REPO datasetTypeName storageClass Dim1 Dim2 DimN