feat(geoarrow-pyarrow): Support table-like objects in to_geopandas()

[paleolimbot]

This PR supports table-like objects in to_geopandas(), ensuring that we use GeoPandas' methods first and fall back on our own if GeoPandas fails (because it's an old version or because it doesn't support the type in question).

import pyarrow as pa
import geoarrow.pyarrow as ga
table = pa.table({"geometry":  ga.as_geoarrow(["POINT (0 1)"])})
ga.to_geopandas(table)

Closes #18.