add maybesend and maybesync to single threaded

Author: hymm

crates/bevy_tasks/src/single_threaded_task_pool.rs

@@ -277,15 +277,21 @@ impl TaskPool {
     /// the browser. Consider using [`spawn_blocking_async`] instead.
     ///
     /// [`spawn_blocking_async`]: Self::spawn_blocking_async
-    pub fn spawn_blocking<T>(&self, f: impl FnOnce() -> T + 'static) -> Task<T>
+    pub fn spawn_blocking<T>(
+        &self,
+        f: impl FnOnce() -> T + 'static + MaybeSend + MaybeSync,
+    ) -> Task<T>
     where
         T: 'static + MaybeSend + MaybeSync,
     {
         self.spawn(async { f() })
     }
 
     /// Spawns a static future on the JS event loop. This is exactly the same as [`TaskPool::spawn`].
-    pub fn spawn_blocking_async<T>(&self, future: impl Future<Output = T> + 'static) -> Task<T>
+    pub fn spawn_blocking_async<T>(
+        &self,
+        future: impl Future<Output = T> + 'static + MaybeSend + MaybeSync,
+    ) -> Task<T>
     where
         T: 'static + MaybeSend + MaybeSync,
     {