Fix implementation challenges (#187)

[Danishswag]

Fixes #187

Bugs

• Added service_date to trips_performed foreign key in fare_transactions, passenger_events, stop_visits, vehicle_locations
• Changed train_car to train_cars in foreign key in passenger_events
• Pointed passenger_events.trip_stop_sequence in passenger_events to stop_visits.trip_stop_sequence in the stop_visits foreign key
• Removed foreign key to stop_times

Styles

• Modified enums for devices to start with an uppercase letter
• Changed all capacity columns to capacity_xxxx

[Danishswag]

Not entirely sure why it failed, looks like error is Error: Unhandled error: HttpError: Resource not accessible by integration in validate-samples.

I did update some of the CSVs in samples/template to the new column names, happy to make any other changes if necessary

[e-lo]

@Danishswag in order to run the CI activities you need to do it form a branch of TIDES-transit/TIDES instead of your local fork. You should be able to do this via quick git push to origin from your local fork: git push origin 187-implementation challenges

[Danishswag]

Unfortunately that didn't work for me, I tried setting my remote to github.com/Tides-transit/TIDES, and when I ran

git push origin 187-implementation challenges I got:

remote: Permission to TIDES-transit/TIDES.git denied to Danishswag.
fatal: unable to access 'https://github.com/TIDES-transit/TIDES/': The requested URL returned error: 403

I think you'll need to add me to the repo/organization with more permissions than I currently have