Create network visualization arcs

[mchuttani18]

draw arcs from selected point to all other points in a network:

https://docs.mapbox.com/mapbox-gl-js/example/animate-point-along-route/

[ericrobskyhuntley]

Wondering about the visual logic of this---the spider-map visualization suggests that the selected point is in some way central to the network (which it isn't). If there is a hub point, it should probably be the owner address(es). The issue with this is going to be that we don't have all owner addresses geolocated (currently, the preprocessing script does not attempt to geocode missing addresses, and I don't plan to implement that because there are simply too many).

My suggested flow might be...

1. if the owner address has a location, draw the network.
2. else, hit the mapbox geocoder and return point(s) for the owne(r),
   1. if result, draw the network
      1. (nice-to-have): post the point to the django db so that we can skip geocoder query in the future.
   2. else, don't draw network lines.