New wrapper classes for Geo3d

Hi,

After the latest developments in the Geo3d library, in particular:

https://issues.apache.org/jira/browse/LUCENE-7906 : Spatial relationships between GeoShapes
https://issues.apache.org/jira/browse/LUCENE-7936: Serialization of GeoShapes.

I propose a new set of wrapper classes which can be for example linked to Solr as they implement their own SpatialContextFactory. It provides the capability of indexing shapes with
spherical geometry.

Thanks!