[PostGIS] #5933: Support TopoGeometry creation from TopoElement for CreateTopoGeom

[PostGIS]

#5933: Support TopoGeometry creation from TopoElement for CreateTopoGeom
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 Reporter:  latot    |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.5.4
Component:  postgis  |    Version:  3.5.x
 Keywords:           |
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 Hi! I think would be useful to allow the function CreateTopoGeom works
 also for a TopoElement, we do not always need build one from a set of
 geometries/topoelements, so would simplify a lot the direct creation of a
 TopoGeometries.

 A signature like:


 {{{
 topogeometry CreateTopoGeom(varchar toponame, integer tg_type, integer
 layer_id, topoelement tg_objs);
 }}}

 We can also cast a topoelement to topoelementarray, aside of the actual
 casting is not working, I think is good have both, is not common sense
 know which casts are allowed and which not, so keep both could do this a
 lot simpler.

 Thx!
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5933>
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