[PostGIS] #5776: ST_LineSubstring 3D support

[PostGIS]

#5776: ST_LineSubstring 3D support
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  Reporter:  vla123   |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.4.4
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
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Comment (by pramsey):

 Hm. Implication is the need for an `ST_3DLineSubstring` because silently
 processing the 3D coordinates in ST_LineSubstring will have the same
 problem in reverse.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5776#comment:3>
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