Add `TomTom::Matrix`

A new component to the `TomTom` module that asks TomTom's Matrix API
endpoint
(https://developer.tomtom.com/online-routing/online-routing-documentation/matrix-routing)
to compute `WayCost`s. The matrix API will give us all costs between
each pair of coordinates. This will enable us to provide costs for any
combination of points in a journey pattern.

Given a list of `WayCost`s, it will send all points from those costs to
the matrix API and return a list of all non-zero `WayCost`s between all
pairs of coordinates.

`points_from_way_costs()` extracts unique coordinates from the
`WayCost`s.

`points_as_params()` builds a list of points in the format expected by
the matrix API.

The response from the matrix API is formatted as a two-dimensional array
consisting of rows and columns that pair each "origin" point with each
"destination" point. We loop through this matrix and construct new
`WayCost` objects for each pair of coordinates.

At the moment, I haven't figured out how I want to save `WayCost` IDs
when creating the new pairs. Leaving that for later.

Refs #6222

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