Identify test data sets for SRCNet0.1

For SRCNet0.1 we need to identify scientifically and technically-motivated data sets that can help us test the 0.1 system. We already have a wealth of possible data sets identified as part of the mini-SRCNet demonstrator, within the current Rucio instance, and relating to the existing example workflows. Let's make a sized plan for data that we'd like to ingest into the DDM system of the SRCNet0.1 sites