[PostGIS] #5274: Expose function to report azimuth of edges from node

[PostGIS]

#5274: Expose function to report azimuth of edges from node
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  Reporter:  strk         |      Owner:  strk
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS 3.5.0
 Component:  topology     |    Version:  master
Resolution:               |   Keywords:
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Comment (by strk):

 Or the function could return angle from CW (or CCW) edge end, which may be
 easier to deal with (small angle == spike)
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5274#comment:2>
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