Implement const char* GeoArrowInferExtensionName(const struct ArrowSchema*)

[paleolimbot]

There's a good deal of code in Python that would have to be duplicated in R to support inferring the extension name from a storage array. The inference is basically:

• Binary/Large Binary -> geoarrow.wkb
• String/LargeString -> geoarrow.wkt
• Struct/FixedSizeList -> geoarrow.point
• List<Struct/FixedSizeList> -> geoarrow.multipoint
• List<List<Struct/FixedSizePoint>> -> geoarrow.multilinestring
• List<List<List<Struct/FixedSizePoint>>> -> geoarrow.multipolygon

I don't think it needs to perform all out validation...just enough to infer what the extension name would be if it were a valid extension storage type. Then it can be passed to ArrowSchemaInitFromStorage() to do the actual validation.