[get_foodGroupFromToDF] Add possibility to select group aggregation level

[frgfm]

As we aggregate the balanced split at groupAlim_1, we need to pass an argument selecting groupAlim_1 or groupAlim_2 to get_foodGroupFromToDF.

First fix attempt didn't work as many entries go through model matching
https://github.com/dataforgoodfr/batch5_phenix_happymeal/blob/master/preprocessing/categorization.py#L111-L114

Instruction

    input_listing = ct.get_foodGroupFromToDF(input_listing,
                                             EAN_col='EAN',
                                             product_name_col='Produit_Nom',
                                             mapping_file=mapping_file,
                                             model_classifier_file=model_classifier_file,
                                             model_matching_file=model_matching_file,
                                             group_name='labelAlim_1')

Current behaviour

input_listing.columns
Index(['Produit_Nom', 'EAN', 'VALEUR EN STOCK UNITAIRE (HT) ', 'quantity',
       'TOTAL (HT)', 'phenix_grams', 'off_grams', 'weight_grams',
       'labelAlim_2', 'statutAlim_2'],
      dtype='object')

Thus the meal grouping algo fails on all cases where the group isn't in the level 1 list.

Expected behaviour

input_listing.columns
Index(['Produit_Nom', 'EAN', 'VALEUR EN STOCK UNITAIRE (HT) ', 'quantity',
       'TOTAL (HT)', 'phenix_grams', 'off_grams', 'weight_grams',
       'labelAlim_1', 'statutAlim_1'],
      dtype='object')