Choose parquet name uid and list unprocessed files

The current naming convention for parquet file is using the uproot UID, which is different from the UID used in DAS. This merge offers the possibility to choose the naming convention (DAS or Legacy). In addition, the DAS uid convention makes it easier to compare the produced parquets and root files in sample.json. This merge also provides a script to generate a new json containing the list of unprocessed files due to failed or incomplete jobs.