Google Distance Matrix node with support for traffic models

[koettert]

As a user I want to specify the traffic model to use when calculating the distances e.g. to get consistent results independent of the API call time or to compare worst case to best case reachable area. https://developers.google.com/maps/documentation/distance-matrix/distance-matrix#traffic_model

Also needs to include the departure time: https://developers.google.com/maps/documentation/distance-matrix/distance-matrix#departure_time However for letting the user pick a time we would need a date&time picker component in the Python nodes.