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/label/label.rs

@@ -1,4 +1,4 @@
-use gpui::WindowContext;
+use gpui::{StyleRefinement, WindowContext};
 
 use crate::{prelude::*, LabelCommon, LabelLike, LabelSize, LineHeightStyle};
 
@@ -70,6 +70,17 @@ impl Label {
     }
 }
 
+// Style methods.
+impl Label {
+    fn style(&mut self) -> &mut StyleRefinement {
+        self.base.base.style()
+    }
+
+    gpui::margin_style_methods!({
+        visibility: pub
+    });
+}
+
 impl LabelCommon for Label {
     /// Sets the size of the label using a [`LabelSize`].
     ///