big change: shallow render

With this commit, component only render child
components if they have different props (shallow
equality). Otherwise, we trust the reactivity
system to make sure that all impacted components
are updated

tests/components/concurrency.test.ts

@@ -543,7 +543,7 @@ test("properly behave when destroyed/unmounted while rendering ", async () => {
   }
 
   class Child extends Component {
-    static template = xml`<div><SubChild /></div>`;
+    static template = xml`<div><SubChild val="props.val"/></div>`;
     static components = { SubChild };
     setup() {
       useLogLifecycle(steps);
@@ -1900,18 +1900,13 @@ test("concurrent renderings scenario 13", async () => {
     "Child:willPatch",
     "Child:patched",
     "Parent:willRender",
-    "Child:willUpdateProps",
     "Child:setup",
     "Child:willStart",
     "Parent:rendered",
     "Child:willRender",
     "Child:rendered",
-    "Child:willRender",
-    "Child:rendered",
     "Parent:willPatch",
-    "Child:willPatch",
     "Child:mounted",
-    "Child:patched",
     "Parent:patched",
     "Child:willRender",
     "Child:rendered",