Demonstrate dis.fire() with view_user_settings

Like a5f3318f3b, this proves that the new dispatcher conversion works for fire-and-forget style dispatches too. This is another obvious-if-broken and generally safe conversion to make.

Other actions which can be dispatched this way have been excluded for reasons mentioned in the Action enum's comments.

src/dispatcher/actions.ts

@@ -33,5 +33,10 @@ export enum Action {
      * View a user's profile. Should be used with a ViewUserPayload.
      */
     ViewUser = "view_user",
+
+    /**
+     * Open the user settings. No additional payload information required.
+     */
+    ViewUserSettings = "view_user_settings",
 }