CSG tooling is unintuitive and a bit tedious to use

[jayrulez]

Proposing that the CSG tooling is refactored to make the tool more useful and intuitive.

I think the Whitebox tooling in O3DE, the GreyBoxing tooling in ezEngine, or the procedural geometry tooling in LumixEngine are good references (UX) if the CSG tooling here is to be refactored.