Extend OrienterNet to fetch OvertureMaps data as a map source

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.