Support writing geoparquets as output

Why it matters

This feature enables users to export data stored in ClickHouse into the GeoParquet format, which is suited for geospatial data interoperability. It solves the problem of lacking native GeoParquet export, enhancing integration with GIS tools and ecosystems that consume GeoParquet files.

How to use it

Users can specify the output format as GeoParquet when exporting query results by using the FORMAT GeoParquet clause in their SELECT statements.