Add CI test for Windows build

[kisvegabor]

Introduce the problem

We have some warnings shown only MSVC.

Proposal

It's would be nice to set up a Window CI as well.

[lvgl-bot]

We need some feedback on this issue.

Now we mark this as "stale" because there was no activity here for 14 days.

Remove the "stale" label or comment else this will be closed in 7 days.

[kisvegabor]

Not stale

[liamHowatt]

I have opened a PR for building on Windows with GCC which supports windows.h and contains exceptions to the standard such as _aligned_malloc found in MSVC. #6015. This can be a starting point for using MSVC. It may be simple to use MSVC in CMake, but I do not know for certain, and wanted to establish some progress in the right direction in case MSVC is not trivial to use in CMake. cl.exe is the compiler that'd be invoked at each build step.

Since we just want to build for now, it might be simpler to maintain a build script (?) separate from CMake for MSVC.

[kisvegabor]

Great! Let's continue in the PR! 🙂