Investigate FOLDER property for targets

[jschwe]

Might clean up the target view in some IDEs

https://cmake.org/cmake/help/latest/prop_tgt/FOLDER.html#prop_tgt:FOLDER

[OlivierLDff]

That would be nice for visual studio, and it is really easy to add.
Everything in a rust folder or corrosion?

[jschwe]

I was also wondering about rust vs. corrosion.
Probably also some subfolders should be created for workspaces based on the workspace folder structure.

Edit: I'd probably prefer "rust" or "Rust" for the actual crate targets. Our internal helper targets could all be placed in some other folder (hidden / internal or similar).