Toggle & Switch (#21979)

![CleanShot 2024-12-13 at 11 27
39@2x](https://github.com/user-attachments/assets/7c7828c0-c5c7-4dc6-931e-722366d4f15a)

- Adds the Switch component
- Updates `Selected`, `Selectable` -> `ToggleState`, `Toggleable`
- Adds `checkbox` and `switch` functions to align better with other
elements in our layout system.

We decided not to merge Switch and Checkbox. However, in a followup I'll
introduce a Toggle or AnyToggle enum so we can update
`CheckboxWithLabel` -> `ToggleWithLabel` as this component will work
exactly the same with either a Checkbox or a Switch.

Release Notes:

- N/A

crates/workspace/src/dock.rs

@@ -781,7 +781,7 @@ impl Render for PanelButtons {
                         .trigger(
                             IconButton::new(name, icon)
                                 .icon_size(IconSize::Small)
-                                .selected(is_active_button)
+                                .toggle_state(is_active_button)
                                 .on_click({
                                     let action = action.boxed_clone();
                                     move |_, cx| cx.dispatch_action(action.boxed_clone())