distance-to-cloud UDF doesn't work on Python 3.11 image #226
Description
Te distance-to-cloud UDF does not work on openeo's Python 3.11 image, as that image doesn't contain the skimage module: https://github.com/Open-EO/openeo-gfmap/blob/main/src/openeo_gfmap/preprocessing/udf_score.py#L7
Need to add a sys.path.append to the UDF to allow users to give external dependencies via the udf-dependency-archives job option.
Still, this would make it the user's responsibility to create and add these dependencies to the job options, otherwise the UDF will fail. Need to think about how we can make this user-friendly.