Expose geometry type as an arrow geometry format

[Skaidus]

First of all great work with this extension!

I've tried to query geoparquet files using duckdb and its geospatial extension. It seems that it has its own binary type for performance. I would like to know about how would it be mapped directy to geoarrow, since converting it to WKB or WKT as an intermediate step makes the performance gains probably not worth it.

In addition, would love to know more about the geometry type internals.

Thank you in advance.