Write a table with geoarrow.wkb column to FlatGeoBuf

[paleolimbot]

When I do:

write_flatgeobuf()

...when the geometry is geoarrow.wkb encoded, I get:

Exception: General error: Expected GeoArrow native type, got 'geoarrow.wkb'.
If you're passing a serialized GeoArrow type like 'geoarrow.wkb' or 'geoarrow.wkt', you need to parse to a native representation.

I seem to remember the motivation here was that wkb is slower; however, at the point that you're writing to disk is that really relevant? (Or alternatively, is there a compact incantation to like parse_to_native_representation() that could be pointed to in the error message?)

[kylebarron]

I think this is part of my general refactor to split native types and serialized types. So right now the writer expects only native types. But it would be ideal to extend this to handle all geoarrow types