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/zeta/src/rate_completion_modal.rs

@@ -578,7 +578,7 @@ impl Render for RateCompletionModal {
                                                 .inset(true)
                                                 .spacing(ListItemSpacing::Sparse)
                                                 .focused(index == self.selected_index)
-                                                .selected(selected)
+                                                .toggle_state(selected)
                                                 .start_slot(if rated {
                                                     Icon::new(IconName::Check).color(Color::Success).size(IconSize::Small)
                                                 } else if completion.edits.is_empty() {