Add reading Feature properties to GeoJsonReader

The current GeoJsonReader can import a whole FeatureCollection but it is difficult to later identify each Feature by its geometry. I think it would be very helpful to add the properties of a Feature as user data to the Feature geometry. For my own purposes I had to modify just one method in the current GeoJsonReader to achieve that.

  private Geometry createFeature(Map<String, Object> geometryMap, GeometryFactory geometryFactory)
      throws ParseException {
      try {
          @SuppressWarnings("unchecked")
          Map<String, Object> innerGeometryMap = (Map<String, Object>) geometryMap.get(GeoJsonConstants.NAME_GEOMETRY);
          @SuppressWarnings("unchecked")
          Map<String, Object> properties = (Map<String, Object>) geometryMap.get(GeoJsonConstants.NAME_PROPERTIES);
          Geometry geometry = create(innerGeometryMap, geometryFactory);
          geometry.setUserData(properties);
          return geometry;
      } catch (RuntimeException e) {
          throw new ParseException("Could not parse Feature from GeoJson string.", e);
      }
  }

It would be nice if this could be added to the official GeoJsonReader.

Start in GeoJsonReader at the createFeature method shown in the issue and inspect how Feature geometry is created from its properties. Done means imported Feature geometries retain their Feature properties as user data, with behavior verified against the existing GeoJsonReader coverage.