Extend OrienterNet to fetch OvertureMaps data as a map source

[jenningsanderson]

Currently, OrienterNet has support to read data for a given bbox via the OpenStreetMap API. The data is then re-assembled into geometries and converted to a series of specific classes (atm, bench, buildling_outline, etc.).

Source: https://github.com/facebookresearch/OrienterNet/tree/main/maploc/osm

Extending support for Overture Maps data (https://docs.overturemaps.org/) could simplify some of this processing.

The same OSM data is available through Overture, where it has already been processed:

1. Available as GeoParquet on S3, which allows for the same bbox query.
2. The geometries are already assembled into Points, Lines, Polygons, etc.
3. Data has already been classified into specific theme, type, subtype, and classes.

[sarlinpe]

Thank you for this excellent suggestion. I agree that fetching data from Overture Maps would be a great, relatively low-effort addition and a better data source on the long term. I don't have the bandwidth to work on this myself, but I will be happy to review and merge any PR implementing this.