Extract new editor host command session bridge

new_editor/app/Application.h

@@ -24,17 +24,12 @@
 
 namespace XCEngine::UI::Editor {
 
-class Application : public UIEditorHostCommandHandler {
+class Application {
 public:
     Application() = default;
 
     int Run(HINSTANCE hInstance, int nCmdShow);
 
-    UIEditorHostCommandEvaluationResult EvaluateHostCommand(
-        std::string_view commandId) const override;
-    UIEditorHostCommandDispatchResult DispatchHostCommand(
-        std::string_view commandId) override;
-
 private:
     static LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);