ENH: Quantities of element layers

### Enhancement Description

Would it be possible to also get other quantities of layers than just the thickness. It would be very useful to have area and volume (at least volume). This could play a major role in LCA calculations through IFC where you need the volumes to calculate environmental impact. I've checked in several viewers I found always only thickness.

I don't think these quantities are by default calculated by Revit, however the Roombook extension does calculate them.

I talked to Angel Valez about this on bSi summit Valencia. Maybe this can be used: https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcquantityresource/lexical/ifcphysicalcomplexquantity.htm

e.g.

### Revit Version

2024.0.x

### IFC for Revit Addon Version

24.x.x

### Windows Version

11 22H2

Start by reviewing the existing IFC export path for layer thickness quantities and the linked IFC2x3 IfcPhysicalComplexQuantity specification. Determine how area and volume should be represented for element layers, then verify that exported IFC data exposes the requested quantities for LCA workflows.

Written by the indexing model from the issue text.