TomTom::Batch: Extract code to `#extract_costs_to_way_costs!`

Extract some code from `#batch` to allow us to test the part that takes
distance and time values from the response JSON and put fill them into
`WayCost`s.

In order for the test to work, had to add an `#==` method to `WayCost`
and make `distance` and `time` accessors.

The JSON file fixture is a copy of a response from the TomTom `/batch`
API. The file is pretty big. I'm not sure if maybe I should condense it
for the sake of test performance.

Refs #6095

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