Fix effects triggered from async tasks; improve work scheduling docs (#2370)

* outline work scheduling

* move scheduling code from dirty_scope to scheduler

* introduce queue_effect

* Run effects after all tasks are polled if there are no components rerendered

* add a new test for async effects

packages/core/src/render_signal.rs

@@ -1,4 +1,4 @@
-//! In dioxus, effects are run using normal async functions after a render. [RenderSignalFuture] is a future that resolves after a render has passed.
+//! TODO: We no longer run effects with async tasks. Effects are now their own type of task. We should remove this next breaking release.
 
 use std::cell::RefCell;
 use std::future::Future;