[WIP] In the pythons extensions section let's create a new "transit" edge provider. It takes a gtfs file. The edge expansion specification follows: [Contains lat/lon/time] -> for every nearby stop, a vertex with stop_id, and time at arrival [Contains stop i...

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original description:

In the pythons extensions section let's create a new "transit" edge provider. It takes a gtfs file. The edge expansion specification follows:

[Contains lat/lon/time] -> for every nearby stop, a vertex with stop_id, and time at arrival
[Contains stop id] -> for every vehicle departure in the next X hours, a vertex representing being on the vehicle moments after boarding. It should have (time, trip_id, stop sequence in trip, and "vehicle_state:boarding"). This is a boarding vertex.
[Boarding vertex] -> goes to an "alright vertex" at the next stop on the trip. An alright vertex is very similar to a boarding vertex except the time corresponds to a the arrival time at the stop, not the departure time.
[Alright vertex] -> goes to the "boarding vertex" at the same stop, and also the stop vertex at the same stop.

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