feat: add blanket IntoAttributeValue impl for references (#5447)

* feat: add blanket IntoAttributeValue impl for references

Adds `impl<T: IntoAttributeValue + Clone> IntoAttributeValue for &T` so
users don't need to explicitly dereference or clone when passing references
to RSX attributes.

Closes #5444

* use to-owned

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/core/src/nodes.rs

@@ -1123,6 +1123,12 @@ impl<T: IntoAttributeValue> IntoAttributeValue for Option<T> {
     }
 }
 
+impl<T: ToOwned<Owned = R>, R: IntoAttributeValue> IntoAttributeValue for &T {
+    fn into_value(self) -> AttributeValue {
+        self.to_owned().into_value()
+    }
+}
+
 pub struct AnyFmtMarker;
 impl<T> IntoAttributeValue<AnyFmtMarker> for T
 where