krata: rework xenstore watch for reliability

crates/xen/xenstore/examples/watch.rs

@@ -7,7 +7,8 @@ async fn main() -> Result<()> {
     env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
     let path = args().nth(1).unwrap_or("/local/domain".to_string());
     let client = XsdClient::open().await?;
-    let mut handle = client.watch(&path).await?;
+    let mut handle = client.create_watch().await?;
+    client.bind_watch(&handle, path).await?;
     let mut count = 0;
     loop {
         let Some(event) = handle.receiver.recv().await else {