Improve reading of CSV files

[Mibblez]

Summary

• Update reading of CSV files to use pandas.read_csv() so that large CSVs don't cause python to explode
• get_plotting_data.py -> SpatialCsvData.from_csv() has a mostly complete implementation. Base work off of that
• Work to be done in branch update-FileReading
• Make a new venv and make sure you're using python 3.11

TODO

• get_plotting_data.py -> SpatialCsvData.from_csv()
  • Throw error when CSV is empty
  • Throw error when header does not contain necessary columns (maybe use plotting_helper.py -> check_aedat_csv_format())
  • Update tests accordingly
• get_plotting_data.py -> read_aedat_csv
  • Update CSV reading to use pandas.read_csv()
  • Update camera type handling to be similar to SpatialCsvData.from_csv()
• event_density.py -> main()
  • Update CSV reading to use pandas.read_csv()
• spike_graph.py -> get_activity_area()
  • Update CSV reading to use pandas.read_csv()
• process_CSV.py -> process_csv_files()
  • Update CSV reading to use pandas.read_csv()
• extract_pgm.py -> main()
  • Update CSV reading to use pandas.read_csv()