wip: rip out unsafe task engine

packages/desktop/examples/async.rs

@@ -19,7 +19,7 @@ fn app(cx: Scope<()>) -> Element {
     let mut count = use_state(&cx, || 0);
     log::debug!("count is {:?}", count);
 
-    cx.push_task(|| async move {
+    cx.push_future(|| async move {
         tokio::time::sleep(Duration::from_millis(1000)).await;
         println!("count is now {:?}", count);
         count += 1;