Add ListEarliestRevisions, which computes the earliest revision of all dir/cnt objects at once
It will be used to speed-up the provenance index building, which currently takes months while ListEarliestRevisions takes 29h on swh1.enst.fr
It will be used to speed-up the provenance index building, which currently takes months while ListEarliestRevisions takes 29h on swh1.enst.fr