Geometry encoding parameter for shapes

[keller-mark]

Fixes https://github.com/scverse/spatialdata/issues/799 The to_parquet function supports a geometry_encoding parameter. When geoarrow, it will be more efficient to read/parse the geometries, as the data can stay in its parquet/arrow memory layout during downstream usage. Visualization applications will benefit from this (and other applications such as data processing pipelines should too).