ENH: add automatic detection of 2.5D in write_dataframe

[theroggy]

closes #222

apparently closes #121 as well

[jorisvandenbossche]

Thanks for looking into this! Couple of quick questions

[brendan-ward]

Thanks for working on this @theroggy . Per the comment, I wonder if we can more deliberately catch the GDAL error for FlatGeobuf to make a nicer error message.

[brendan-ward]

Thanks @theroggy ; the failing test will be a helpful signal that GDAL fixed it. Thanks for reporting the bug there.

[jorisvandenbossche]

The geopandas test suite discovered one issue with this (https://github.com/geopandas/geopandas/actions/runs/4454470754/jobs/7823684402?pr=2834): if you have mixed 3D geometry types, the geometry_type gets inferred as "2.5D Unknown", which then gives "Geometry type is not supported: 2.5D Unknown"

I suppose for the case of mixed, we just need to use "Unknown" without prepending "2.5D"

[theroggy]

The geopandas test suite discovered one issue with this (https://github.com/geopandas/geopandas/actions/runs/4454470754/jobs/7823684402?pr=2834): if you have mixed 3D geometry types, the geometry_type gets inferred as "2.5D Unknown", which then gives "Geometry type is not supported: 2.5D Unknown"

I suppose for the case of mixed, we just need to use "Unknown" without prepending "2.5D"

I'll have a look...