Add query for OS revision number to windows-version crate

[kennykerr]

The windows-version crate provides reliable operating system version information without the need for application manifest files. The OsVersion struct provides the traditional OS version information for major, minor, service pack, and build number. Unfortunately, recent Windows versioning conventions have largely dropped the use of minor and service pack versions while adding a new revision number as you can see when you run commands like winver.exe or cmd.exe.

This update adds a revision function to the windows-version crate that lets you reliably get the same version information used by these OS tools. Here's a simple example that mimics what cmd.exe displays:

fn main() {
    let current = windows_version::OsVersion::current();

    let major = current.major;
    let minor = current.minor;
    let build = current.build;
    let revision = windows_version::revision();

    println!("Microsoft Windows [Version {major}.{minor}.{build}.{revision}]");
}