add purpose index num to preprocessor for sharrow

Author: jpn--

configs/resident/trip_destination_annotate_trips_preprocessor.csv

@@ -37,3 +37,4 @@ adding _trips to avoid conflict with the variables in the tours_merged,age_trips
 ,microTour,"np.where((tour_mode == 'ESCOOTER') | (tour_mode == 'EBIKE'), 1, 0)"
 ,ebikeTour,"np.where((tour_mode == 'EBIKE'), 1, 0)"
 Micromobility access Time,o_MicroAccessTime,"reindex(land_use.MicroAccessTime,df.origin)"
+,purpose_index_num,"size_terms.get_cols(df.purpose)"