Extend head components with global attributes (#2888)

* Fix hot reloading components with keys

* include component formatted segment keys, but not dynamic component value

* extend each head component with the corresponding element

* Allow spreading custom attributes into components

* Fix component_literal_dyn_idx index

* add a new test for hot reloading components with keys

* FIx script without body warning and rendering styles with a href set

* fix clippy

examples/spread.rs

@@ -19,7 +19,8 @@ fn app() -> Element {
             extra_data: "hello{1}",
             extra_data2: "hello{2}",
             height: "10px",
-            left: 1
+            left: 1,
+            "data-custom-attribute": "value",
         }
     }
 }