Rework Type Generation

[danthonywalker]

Currently, types are generated by hitting the REST API pseudo-randomly and using the responses to generate types. This is extremely inefficient (both in time and use of rate limits) and does not cover every response case,

Transitland provides schemas in the form of GraphQL objects.
https://github.com/interline-io/transitland-server/tree/main/schema

The REST API uses GraphQL internally which means these schemas should be identical to the REST client. Similar to the transitland-gql-client project, this project should automatically derive types on any schema update.