feature: reverse lookup a street from location

[kfarr]

as a nontechnical user I can search for a street, intersection or address that eventually identifies a slice of street that can be rendered in 3dstreet for visualization or further editing.

more simply: as a nontechnical user I can search for a street and see it in 3dstreet

[kfarr]

From @dabreegster

Overall workflow sounds good to me. You could:

1. display a slippy map with leaflet or maplibre, let people click somewhere
2. Use the Overpass API to get the nearest highway=* matching that, get the tags for that way
3. Feed into the osm2streets lane algorithm, get out the JSON left-to-right things
4. Map that over to streetmix segments

For tracking 3, see a-b-street/osm2streets#224

Next step for this ticket is 1 -- do a basic slippy map with click to set point