Add `GeometryType` / `GeographyType`

[Fokko]

Feature Request / Improvement

I think we should wait until this gets added to Arrow: apache/arrow#45522

[petern48]

Looking into this since it's now merge in.

EDIT: Hmm, I forgot we need to first wait for the release. Still happy to contribute once it's fully rolled out :)

[kevinjqliu]

Looks like it'll be release as part of arrow 21.0.0