[PostGIS] #220: Implement ST_Numcurves and ST_CurveN

[PostGIS]

#220: Implement ST_Numcurves and ST_CurveN
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  Reporter:  robe         |      Owner:  mleslie
      Type:  enhancement  |     Status:  new
  Priority:  low          |  Milestone:  PostGIS 3.5.0
 Component:  postgis      |    Version:  master
Resolution:               |   Keywords:
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Changes (by robe):

 * priority:  medium => low

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/220#comment:7>
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