Make DOM geometry structs serializable (#38828)

Makes the following DOM geometry structs serializable:
- `DOMRect`
- `DOMRectReadOnly`
- `DOMQuad`
- `DOMMatrix`
- `DOMMatrixReadOnly`

Testing: Covered by WPT (`css/geometry/structured-serialization.html`).

---------

Signed-off-by: lumiscosity <averyrudelphe@gmail.com>

components/constellation/constellation.rs

@@ -4168,7 +4168,7 @@ where
             source_browsing_context,
             target_origin: origin,
             source_origin,
-            data,
+            data: Box::new(data),
         };
         let result = match self.pipelines.get(&pipeline_id) {
             Some(pipeline) => pipeline.event_loop.send(msg),