convert libc handle to rust OwnedHandle

libc-handle-to-rust-ownedhandle.rs

 
crates/containerd-shim-wasm/src/sys/windows/stdio.rs

```
    pub fn as_owned(&self)-> Option<OwnedHandle> {
        if let Some(fd) = self.as_raw_fd() {
            return Some(unsafe {OwnedHandle::from_raw_handle(get_osfhandle(fd) as _)});
        }
        
        None
    }
```  
  
crates/containerd-shim-wasm/src/sandbox/stdio.rs   

```
        #[cfg(windows)]
    pub fn as_owned(self) -> Option<OwnedHandle> {
        self.0.as_owned()
    }
```

Pass to the command:
```
     let mut cmd = Command::new("containerd-wasmtime-windows");
        cmd.current_dir(self.bundle.as_path())
         .arg("--address").arg(self.address.clone())
         .arg("--namespace").arg(self.namespace.clone())
         .stdout(self.stio.take().stdout.as_owned());
```