[PostGIS] #5960: Implement ST_3DWithin and ST_3DContains

[PostGIS]

#5960: Implement ST_3DWithin and ST_3DContains
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 Reporter:  robe     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS Fund Me
Component:  postgis  |    Version:  master
 Keywords:           |
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 As suggested in #5827

 might be something to consider for SFCGAL
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5960>
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