Aggregate functions for TopoGeometries

[Felipe Matas]

Hi latot here, to construct new TopoGeometries using other TopoGeometries we need to convert to TopoElements, make an array with them, I think would be ver nice have functions to instead work with TopoElements work directly with TopoGeometries.
The functions I have in mind that could be useful would be the next ones:
CreateTopoGeometry, aggregate function for TopoGeoemtries and TopoElements
An Array type for TopoGeoemtries.

At some point, maybe would be useful have array_agg as input for TopoElements and TopoGeometries? I'm not sure because PG transform this ones to Strings, and would be confusing.
One reason of why use TopoGeometries is that we can check the input TopoGeometries are childs of the layer we are using, so is safer than use TopoElements.
What do you think?

Thx!
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