Description

Basic support for mixed geometry datasets has been assessed and extended recently in GeoNode.
The upload now supports datasets that can contain features with different geometry types.

Quick recap:

• OGR returns wkbUnknown for layers that contain mixed geometries. We map it here using the "Unknown (any)" string representation of the type
• Django has the concept of generic django.contrib.gis.db.models.fields.GeometryField that we use to handle the geometry type for the dataset, in particular for the dynamic models tables.
• Geoserver does the same with org.locationtech.jts.geom.Geometry, whcih is also returned as the binding for the featuretype

So, we should add support to create new datasets with the generic Geometry type.