Add `TomTom` class to communicate with their API

Provides an interface to communicate with the TomTom API. Currently
includes a method `#batch` to make a batch routing request
(https://developer.tomtom.com/online-routing/online-routing-documentation/batch-routing).

Left a bunch of development-related code in just to preserve my
in-progress stages. Originally I was told to use the matrix routing API,
but that turned out to not match what we wanted. Namely, matrix routing
would produce a table with every point routed with every other point. We
instead want routes of each segment in a line, in order (or, just the
diagonal of the matrix). Using the batch API allows us to get the routes
we need without doing unnecessary work.

Update the `WayCost` class to provide `departure` and `arrival` methods
as readers, and make `id` an optional parameter for now. (We still need
to figure out how we're dealing with ID.)

Refs #6095

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