Include dataset discovery tools
We should improve fetch.py
(https://gitlab.cern.ch/HiggsDNA-project/HiggsDNA/-/blob/master/higgs_dna/samples/fetch.py?ref_type=heads) by incorporating https://coffeateam.github.io/coffea/notebooks/dataset_discovery.html so that we do not have to search for sites manually anymore. This is in some sense connected to https://github.com/CoffeaTeam/fsspec-xrootd/issues/36, where solving the redirector issues with multi-source reading is being discussed (the cmssw-way).
Note: coffea.dataset_tools
appears to require coffea>=2023, so this is related to #65.
NB: Not entirely correct, thanks Iason for pointing it out. See comments below.
Edited by Jan Lukas Spah