feat(notification): report actions on desktop (#3671)

* feat(notification): report actions on desktop

A click on a notification (tap) or on one of the actions of its action
type now reaches the JavaScript onAction listeners on desktop, and the
new Rust Notification::on_action on every platform. On Linux and the
BSDs the click comes from the notification server's ActionInvoked
signal; on Windows and macOS from notify-rust's wait_for_response,
which needs notify-rust 4.18.

register_action_types, remove_active (Linux and the BSDs) and the
listener commands are implemented for desktop, so they no longer fail
with "command not found".

The api example sends a notification with two actions and shows the
action it hears.

Closes #2150, closes #1903.

* fix(notification): complete desktop action API

* cleanup

---------

Co-authored-by: Haex <hexxx@ok.de>
Co-authored-by: Lucas Nogueira <lucas@tauri.app>

examples/api/src/views/Notifications.svelte

@@ -1,8 +1,43 @@
 <script>
-  import { sendNotification } from '@tauri-apps/plugin-notification'
+  import { onDestroy, onMount } from 'svelte'
+  import {
+    onAction,
+    registerActionTypes,
+    sendNotification
+  } from '@tauri-apps/plugin-notification'
   export let onMessage
 
   let sound = ''
+  let actionListener
+
+  onMount(async () => {
+    await registerActionTypes([
+      {
+        id: 'api-example',
+        actions: [
+          { id: 'open', title: 'Open' },
+          { id: 'later', title: 'Later' }
+        ]
+      }
+    ]).catch(onMessage)
+    // a click on the notification arrives as `tap`, a button as its id
+    actionListener = await onAction((event) => {
+      onMessage(
+        `Action "${event.actionId}" on notification ${event.notification?.id}`
+      )
+    }).catch(onMessage)
+  })
+
+  onDestroy(() => actionListener?.unregister())
+
+  function sendActionNotification() {
+    sendNotification({
+      id: Math.floor(Math.random() * 100000),
+      title: 'Notification with actions',
+      body: 'Click it or one of its buttons',
+      actionTypeId: 'api-example'
+    })
+  }
 
   // send the notification directly
   // the backend is responsible for checking the permission
@@ -42,3 +77,6 @@
 <button class="btn" id="notification" on:click={triggerNotification}>
   Send test notification
 </button>
+<button class="btn" id="notification-actions" on:click={sendActionNotification}>
+  Send notification with actions
+</button>