[QGIS-Developer] Choose DEM layer as terrain in 3D view using PyQGIS

[Stefanos Natsis]

Hi Abdelghani,

You need to create a symbol, set its data defined properties, assign it to
a 3d renderer and then assign the 3d renderer to the layer:

```
s = QgsPolygon3DSymbol()
p = QgsProperty()
p.setField('field_containing_height')
c = QgsPropertyCollection()
c.setProperty(QgsPolygon3DSymbol.Property.ExtrusionHeight, p)
s.setDataDefinedProperties(c)
layer.setRenderer3D(QgsVectorLayer3DRenderer(s))
```

Best,
Stefanos
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