refactor(new_editor/app): reorganize host structure and add smoke test

new_editor/app/Platform/Win32/WindowMessageDispatcher.cpp

@@ -0,0 +1,26 @@
+#include "WindowMessageDispatcher.h"
+
+#include "WindowMessageDispatchHandlers.h"
+
+namespace XCEngine::UI::Editor::Host {
+
+bool WindowMessageDispatcher::TryDispatch(
+    HWND hwnd,
+    WindowMessageHost& windowHost,
+    App::EditorWindow& window,
+    UINT message,
+    WPARAM wParam,
+    LPARAM lParam,
+    LRESULT& outResult) {
+    const WindowMessageDispatchContext context = {
+        .hwnd = hwnd,
+        .windowHost = windowHost,
+        .window = window,
+    };
+
+    return TryDispatchWindowChromeMessage(context, message, wParam, lParam, outResult) ||
+        TryDispatchWindowLifecycleMessage(context, message, wParam, lParam, outResult) ||
+        TryDispatchWindowInputMessage(context, message, wParam, lParam, outResult);
+}
+
+} // namespace XCEngine::UI::Editor::Host