Add location searching to Gnome Calendar

I dig this feature in other mainstream calendar products, such as Apple Calendar or Google Calendar. I am thinking of the list of suggested locations that drop down from the event “location” field as I type. These suggestions are from Google Maps or Apple Maps, but I imagine there is some open-source database of locations that could be used, such as OpenStreetMap.

Patches are welcome: Address / location search (autocompletion choices) via OpenStreetMap / GraphHopper (#472) · Issues · GNOME / gnome-calendar · GitLab