Add support for long-format DFs#150
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Description of changes:
fev.Taskconvert_long_df_to_hf_datasetby using pyarrow operations instead of pandas groupbyDataset.sortwith sorting on thepa.Tableto avoid creating_indicesthat need to be flattened afterwardsBy submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.