Migrate Socrata Open Data Portal ETLs to new data model

[johnclary]

Port the socrata export ETL to the new data model.

Misc DB changes needed

• [x] rename atd_mode_category to vz_mode_category
• [x] create migrations to create convert vz_mode_category into a generated column - this is replacing the atd_txdot_units_create_update function
• [x] We are incorrectly joining the mode category lookup on unit_desc_id in the people list view
• [x] Create dedicate views for crash and people open data

[johnclary]

WIP here