refactor!: improve surface action handling and adjust libcosmic API

src/task.rs

@@ -0,0 +1,25 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: MPL-2.0
+
+//! Create asynchronous actions to be performed in the background.
+
+use std::future::Future;
+
+/// Yields a task which contains a batch of tasks.
+pub fn batch<X: Send + 'static + Into<Y>, Y: Send + 'static>(
+    tasks: impl IntoIterator<Item = iced::Task<X>>,
+) -> iced::Task<Y> {
+    iced::Task::batch(tasks).map(Into::into)
+}
+
+/// Yields a task which will run the future on the runtime executor.
+pub fn future<X: Into<Y>, Y: 'static>(
+    future: impl Future<Output = X> + Send + 'static,
+) -> iced::Task<Y> {
+    iced::Task::future(async move { future.await.into() })
+}
+
+/// Yields a task which will return a message.
+pub fn message<X: Send + 'static + Into<Y>, Y: 'static>(message: X) -> iced::Task<Y> {
+    future(async move { message.into() })
+}