Windows Support #89

cppjit currently drops Windows support from upstream cppyy, and this is a planned future development.

The goal would be to add currently audit what parts of the codebase perform Windows specific handling, what pieces are actually still necessary and modernize them to work on latest Windows platforms and currently supported MSVC versions. Following CPython 3.12–3.14 official Windows builds, we should target VS 2022+ for 64-bit Windows platforms.

This would also require extending our CI infrastructure to build and test on Windows. If these steps are completed and support is established in a stable way, we can add Windows to the list of platforms that we build wheels for.