Support MSVC with the new CMAKE build

[Cewein]

The CMake build system works well on Windows when using MSYS2. However, it currently does not work out of the box with MSVC.

Would it be worthwhile to extend support to Windows environments without requiring MSYS2? The new CMake build system seems like a great opportunity to explore this. I understand that moving to MSVC support would be a significant challenge, and this has been previously discussed (e.g., in #2894).

let me know what you think!

[Cewein]

I am working on this, there is an issue regarding PkgConfig for FFTW as it is not present natively on windows. The work around would be to download the DLL present on the FFTW website inside the FindFFTW.cmake.