Adding Windows Support

[saedx1]

Issue #, if available:
#131

Description of changes:

• Closing a file before renaming it as this causes a problem on windows: windows cannot access file because another process is using it.
• In the translation of paths, unfortunately, os.PathSeparator isn't sufficient for windows. This is because windows also accepts / as a separator. Go's official path_windows.go actually does the same thing I'm adding https://go.dev/src/os/path_windows.go - see the first 16 lines of that file.
• I did build the image and push it to my personal github public container registry, so I can confirm that Dockerfile.win has been tested.
• I tested this on EKS with a windows node running 6 or more pods using secrets (as volumes and as env vars).

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[jbct]

Thank you for the PR. I'm going to close it at the moment, because we don't currently have plans to add Windows support. As an option, you may investigate using the driver-writes-secrets flag which may work around the issue you're encountering. Let's use #131 for discussion.