Support microtransit vehicle types and metadata

[FordSmartMobility]

Currently, the vehicle_type field present in the Provider spec supports only bicycle and scooter values. Consider expanding the types available to include values such as sedan, suv, minivan, and van; if the direction is to keep things a bit more generic, these types could be classified under a single automobile category.

Further, the following fields could be added as supplemental information for microtransit types:

• capacity: The number of seats bookable to the public (e.g. not including the driver)
• occupancy: The number of people/seats booked in a trip
• wheelchair_accessibility: True/false

These fields could be available as part of a collection of trips, i.e. Journey, that describes a driver's shift. Trips could then roll up or be otherwise associated to a journey.

[hunterowens]

@FordSmartMobility Thanks for the suggestion! We're working on figuring out how to support multiple vehicle types, see #95.

My preference is that we use the code in generate_schema to use common datatypes (such as Point, timestamp, etc) and then each mobility type gets a subfolder in both agency/ and provider/.

This would 1) make the JSON schema more robust and 2) make it easier to adapt the spec for more mobility options as they happen.

[FordSmartMobility]

Great! We'll close this issue in favor of continuing the conversation through the issue referenced above.