refactor(editor/windowing): promote core into XCUIEditorLib

editor/src/Windowing/EditorWindowSynchronizationPlanner.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <XCEditor/Windowing/EditorWindowSynchronizationPlan.h>
+
+namespace XCEngine::UI::Editor {
+
+class EditorWindowSynchronizationPlanner final {
+public:
+    static EditorWindowSynchronizationPlan Build(
+        const EditorWindowSynchronizationPlannerInput& input);
+};
+
+} // namespace XCEngine::UI::Editor