evaluate geocoding engine

Currently we use Mapbox geocoding engine to get possible destination places. Nevertheless several test that I have performed indicate that its result might not be as good as expected. It might be a good idea to get an estimation of how much do they differ.

A possible strategy to measure it might be:

whenever a user request geocode for a place and no results are return
call photon.koomot.de api and see if a result is displayed
if so then submit the diff somewhere (firebase, http post)
make a weakly report of incidents agregating similar ones

hiposfer / hive

evaluate geocoding engine #33