Filter out charging stations outside of distance tolerance

[nreinicke]

In our ChargingStationLocator struct, the current default behavior for a charging station that is outside of the station_match_tolerance is to fail if we cannot match to a vertex. I think this remains fine for a default behavior but we should also allow the option to just filter out those charging stations. We could introduce a new config enum like ChargingStationMatchStrategy with options to fail on non match or filter on non match and then bring that in a new config parameter.