Add support for Geo3D

[dsmiley]

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The "Geo3D" library (AKA spatial3d module in Lucene) has surface-of-sphere (and WGS84 ellipsoid) shape implementations. It would be awesome to add a Spatial4j SpatialContext, ShapeFactory, and ShapeBuilders. Perhaps DistanceCalculator too.

It remains to be seen what to do about BinaryCodec but ideally the native xyz coordinates would be serialized, not the lat-lon. That should perhaps be a separate issue.

[dsmiley]

FYI Geo3dShape in Lucene's spatial module should be copied into Spatial4j as part of this issue.

Also note that the maven dependency / coordinates may wind up changing dependent on the outcome: https://issues.apache.org/jira/browse/LUCENE-7056

[fer-marino]

what's the status of this?

[dsmiley]

No change (lack of time/project).