Merge branch 'feat-exit' into 'develop'

feat(app ): 自定义退出接口需游戏实现退出弹窗

See merge request unity-cross/UnityDemo!12

Assets/Scripts/demo/ui/HoolaiListener.cs

@@ -98,6 +98,6 @@ public class HoolaiListener : IPlatformCallbackListener
 
     public void OnCustomExit()
     {
-        NativeLogger.I("Game_Unity_Callback", $"OnCustomExit");
+        NativeLogger.I("Game_Unity_Callback", $"OnCustomExit show Game Exit Dialog!");
     }
 }