Support Windows

[CrystalMethod]

Is there any chance to get Sheldon binaries for Windows arm64 a/o amd64? I would be more then happy to test the packages.

[rossmacarthur]

The following fixes will need to be implemented to get sheldon working on windows, not sure if there's anything else. I'm happy to accept PRs for any of these changes.

• [ ] The fmutex dependency does not support windows, we will need to use something like LockFileEx on windows, this could be added either in fmutex or in sheldon I don't mind.
• [ ] lock_and_source_clean_permission_denied test currently uses use std::os::unix::fs::PermissionsExt;, we will probably need an equivalent test on windows and only enable this test on unix.
• [ ] CI will need to be updated to test and release binaries for targets x86_64-pc-windows-msvc and aarch64-pc-windows-msvc

[kvnxiao]

@rossmacarthur What do you think about the fs2 crate and its lock exclusive functions? https://docs.rs/fs2/latest/fs2/trait.FileExt.html if these are sufficient then it would be simple to just swap out fmutex with fs2 and it should compile (minus the test cases obviously) onWindows successfully.