Export trait data in Catalog dataset template

Genesys has a searchable trait database of C&E data. The list of "datasets" is available at https://www.genesys-pgr.org/data/.

It is possible to download the "dataset" as a DwC-A CSV+ZIP file (DarwinCore Archive) that contains all records relating to this dataset.

Add a controller endpoint that will generate the Excel version using the current Catalog Dataset template based on trait data in the database.