feat(json-schema):add cost_calculations file json-schema

[jmkerloch]

closes #46

Enum for operations defined from https://github.com/IGNF/route-graph-generator/blob/268346f0953a47160736ae503bf35c4e344177dc/r2gg/_output_costs_from_costs_config.py#L57

[lgrd]

A simple question, why not in the documentation directory ? :) In Road2, you can see documentation/configuration/{type}/*.json-schema. Maybe, we could have the same logic. What do you think of it ?

[jmkerloch]

@lgrd I stored it in the r2gg directory so we can use it later to check configuration file.

[lgrd]

Oh ! I didn't see the r2gg only the other part... sorry. That's cool ;)