Develop and test data extraction script

[FeldmanMike]

URLs to data:

• 2021: https://opendata.dc.gov/datasets/DCGIS::311-city-service-requests-in-2021
• 2022: https://opendata.dc.gov/datasets/DCGIS::311-city-service-requests-in-2022
• 2023: https://opendata.dc.gov/datasets/DCGIS::311-city-service-requests-in-2023
• 2024: https://opendata.dc.gov/datasets/DCGIS::311-city-service-requests-in-2024

Plan is to extract data from years 2021, 2022, 2023, and 2024.

• 2021 and 2022 will be used for training
• 2023 will be used for validation (e.g., hyperparamater tuning)
• 2024 YTD will be used for a holdout test set (after training on all of 2021, 2022, and 2023)