ui: Add margin style methods to Label and LabelLike (#14032)

This PR adds margin style methods to the `Label` and `LabelLike`
components.

This allows for callers to provide a margin to these components without
needing to introduce a wrapping `div` to do so.

Release Notes:

- N/A

crates/ui/src/components/button/button_like.rs

@@ -332,7 +332,7 @@ impl ButtonSize {
 /// This is also used to build the prebuilt buttons.
 #[derive(IntoElement)]
 pub struct ButtonLike {
-    pub base: Div,
+    pub(super) base: Div,
     id: ElementId,
     pub(super) style: ButtonStyle,
     pub(super) disabled: bool,