[PostGIS] #5848: expose a lower level function of TopoGeo_AddLineString that returns more info

[PostGIS]

#5848: expose a lower level function of TopoGeo_AddLineString that returns more
info
--------------------------------+---------------------------
  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  enhancement        |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.5.3
 Component:  topology           |    Version:  3.4.x
Resolution:                     |   Keywords:
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Comment (by Lars Aksel Opsahl):

 The return struct for the side effects need contain info that shows what
 edges that now represents edge 1 for instance something like this

 {{{
 [
 [0,[3,4]],
 [1,[1,2]]
 ]
 }}}

 The first line(0) is always representing the new line, the next line are
 representing the side effects.
 That tells us that edge 1 has been split into edge 1 and 2.

 Lars
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5848#comment:1>
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