fix City bike helsinki

[eskerda]

Digitransit has long deprecated the routing v1 API. The new endpoint uses otp v2, and the routing endpoint uses graphql.

https://digitransit.fi/en/developers/apis/1-routing-api/

There's one endpoint for the whole Finland + Estonia, and then there's separate endpoints for HSL, south west finland and Waltti cities.

There's both a resource for querying by a bbox and one without. Code clarity wise the implementation without bbox and doing the bbox filtering on our side is much clearer so we are going with that. We can potentially move it to use the separate feeds.

Changes

• Update OTP parser to v2
• Move digitransit into a separate class
• Add helsinki as a digitransit instance with a bbox
• Add more cities from the feed
• Support vehicles when available
• Add / remove fields from the gql query as necessary