ENH: Geometry native type to Iceberg connector

[kaushiksrini]

Description

I recently saw that the Geometry type was accepted into the parquet format (but not yet merged). We are looking forward for these changes to be merged and have the type supported by the native parquet format. Following this, there seems to be interest in adding a geometry native type to iceberg. After this, it would be simple for us to use the underlying geometry type to perform geospatial operations on the data without having to call ST_GeometryFromText, as this operation is quite expensive. I am looking to add this geometry feature to the iceberg connector, once the Iceberg changes have been implemented. I am creating this issue as a placeholder for the work. Let me know if there is already work being done on this, otherwise happy to work on it. Thanks!