[llvm] [docs][CMake] Add CMakePreset, improve VS documentation (PR #84760)

[David Peixotto via llvm-commits]

https://github.com/dmpots approved this pull request.

Thanks for this change! I was able to use it to generate and build with visual studio.

I had a question about enabling asserts for the release build, but otherwise looks good. It was nice to see the `"LLVM_OPTIMIZED_TABLEGEN": "ON"` which makes a big difference when building with msvc and is nice to have that be the default for people that might not be aware of it.

https://github.com/llvm/llvm-project/pull/84760