feat: Use conan instead of custom python scripts - #9500

Can we have this on the side for now so that we can see things independently? Otherwise we'll be fighting conflicts for ever. Just create a independent workflow on an architecture of choice. Create a build-all-conan.py or something. Etc. Thanks!

Hi @aothms, @Andrej730,

I have updated this PR to have mainly additions without changing nix/build-all.py.
I have tested it on my Ubuntu workstation, next week I'll be able to test on Windows.
If one of you have a MacOS workstation, I'm interested by your tests.

The goal of this PR is to simplify local development env setup but also CI.
If you are interested by conan use, I can provide another PR to update CI.

As conan-center-index doesn't yet include recipe for opencollada and openusd, I have added my fork of conan-center-index providing these missing recipes.

I have question about OpenCOLLADA, https://github.com/KhronosGroup/OpenCOLLADA is not maintained since 8 years. Is it really used through IfcOpenShell?

NB: I have used Claude IA to help me in this PR.