feat(widget): add dropdown::multi list widget

src/widget/dropdown/multi/mod.rs

@@ -0,0 +1,19 @@
+// Copyright 2023 System76 <info@system76.com>
+// Copyright 2019 Héctor Ramón, Iced contributors
+// SPDX-License-Identifier: MPL-2.0 AND MIT
+
+mod model;
+pub use model::{list, model, List, Model};
+
+pub mod menu;
+pub use menu::Menu;
+
+mod widget;
+pub use widget::{Appearance, Dropdown, StyleSheet};
+
+pub fn dropdown<'a, S: AsRef<str>, Message: 'a, Item: Clone + PartialEq + 'static>(
+    model: &'a Model<S, Item>,
+    on_selected: impl Fn(Item) -> Message + 'a,
+) -> Dropdown<'a, S, Message, Item> {
+    Dropdown::new(model, on_selected)
+}