feat(server): process requests in batch from a file

[sebhoerl]

This PR lets users use the routing server infrastructure without actually starting a server on an HTTP port. Instead, one can put all the requests that one would send to the server into a JSON file, run the processing script, and obtain all responses in an output JSON file. The input requests and the output responses have the exact same structure as in the HTTP API:

java ... org.eqasim.server.RunProcessor \
  --config-path scenario_config.xml \
  --input-path requests.json \
  --output-path response.json 

Both the input and output files are structured by endpoint:

{
  "road_router": [
    { "origin_x": 1234, "origin_y": 5122, ... }
  ],
  "transit_router": [
    { "origin_x": 1234, "origin_y": 5122, ... }
  ],
  "road_isochrone": [],
  "transit_isochrone": []
}

• Example for input.json in server/src/test/resources/processor/input.json
• Example for output.json server/src/test/resources/processor/output.json