[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
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 Reporter:  Lars Aksel Opsahl  |      Owner:  strk
     Type:  enhancement        |     Status:  new
 Priority:  medium             |  Milestone:  PostGIS 3.5.3
Component:  topology           |    Version:  3.4.x
 Keywords:                     |
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 We need to keep track of each edges source when we merge multiple table
 into a common topology.

 The problem with TopoGeo_AddLineString is that it only return edge id's
 representing the line added.

 Lets say we have a empty topology and add a line from table "one", we then
 return edge id 1 so we know that edge 1 is from table "one".

 Then we add a line from table "two" crossing edge 1, we then return 2 new
 edge id's so we have control of the edges representing line from table
 "two".

 The problem is that we now have lost control of what edges representing
 line from table "one", because edge 1 has been split into two new edges as
 side effect.

 In the low level code of TopoGeo_AddLineString you have control of all
 this side effects.

 Is it it Ok to expose a new method that returns side effects like edges
 that has be splited and so on and not only the edges representing the line
 added ?
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5848>
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