feat(new_editor): add standalone add-component utility window

new_editor/app/Scene/EditorSceneRuntime.cpp

@@ -1,5 +1,6 @@
 #include "Scene/EditorSceneRuntime.h"
 
+#include <XCEngine/Components/ComponentFactoryRegistry.h>
 #include <XCEngine/Components/CameraComponent.h>
 #include <XCEngine/Components/Component.h>
 #include <XCEngine/Components/GameObject.h>
@@ -472,6 +473,36 @@ bool EditorSceneRuntime::MoveGameObjectToRoot(std::string_view itemId) {
     return moved;
 }
 
+bool EditorSceneRuntime::AddComponentToSelectedGameObject(
+    std::string_view componentTypeName) {
+    if (componentTypeName.empty()) {
+        return false;
+    }
+
+    const std::optional<GameObject::ID> selectedId = GetSelectedGameObjectId();
+    Scene* scene = GetActiveScene();
+    if (!selectedId.has_value() || scene == nullptr) {
+        return false;
+    }
+
+    GameObject* gameObject = scene->FindByID(selectedId.value());
+    if (gameObject == nullptr) {
+        return false;
+    }
+
+    Component* addedComponent =
+        ::XCEngine::Components::ComponentFactoryRegistry::Get().CreateComponent(
+            gameObject,
+            std::string(componentTypeName));
+    if (addedComponent == nullptr) {
+        return false;
+    }
+
+    IncrementInspectorRevision();
+    RefreshScene();
+    return true;
+}
+
 bool EditorSceneRuntime::CanRemoveSelectedComponent(
     std::string_view componentId) const {
     const EditorSceneComponentDescriptor descriptor =