Define the import logic for CAOD feeds

[ianktc]

Repurpose the existing import logic used for TDG and JBDA feeds:

https://github.com/MobilityData/mobility-feed-api/blob/main/functions-python/tasks_executor/src/tasks/data_import/transportdatagouv/import_tdg_feeds.py

Clarify that all fields in MobilityDatabase will be accounted for in the CAOD Data Model.

Organizations: https://data.ca.gov/dataset/cal-itp-gtfs-ingest-pipeline-dataset/resource/677e1271-fea5-4c21-92fa-59eb336fde94

GTFS Datasets: https://data.ca.gov/dataset/cal-itp-gtfs-ingest-pipeline-dataset/resource/e4ca5bd4-e9ce-40aa-a58a-3a6d78b042bd

Services: https://data.ca.gov/dataset/cal-itp-gtfs-ingest-pipeline-dataset/resource/dbacfa9f-2148-454c-a08f-a77233f2b8c0

Provider GTFS: https://data.ca.gov/dataset/cal-itp-gtfs-ingest-pipeline-dataset/resource/ebe116fb-b9da-4fee-a0c5-497c9d6d61d7

Proposed flow: services -> provider_gtfs_data -> gtfs_datasets