[NUI] Add FeedMouseWheel as hidden api

- Add some logs in NUICoreBackend.Exit() by request from GBM

src/Tizen.NUI/src/internal/Application/NUICoreBackend.cs

@@ -142,8 +142,16 @@ public void Dispose()
         /// </summary>
         public void Exit()
         {
+            //This appears as an error log but actually does not indicate an error.
+            //The reason it is logged as an error is because the log level displayed in the GBM target is set to 'error' and 'fatal'.
+            //Therefore, although we have included this as an error log for debugging purposes, please note that it is not an actual error log.
+            Tizen.Log.Error("NUI", "NUICoreBackend.Exit() !");
             if (application != null)
             {
+                //This appears as an error log but actually does not indicate an error.
+                //The reason it is logged as an error is because the log level displayed in the GBM target is set to 'error' and 'fatal'.
+                //Therefore, although we have included this as an error log for debugging purposes, please note that it is not an actual error log.
+                Tizen.Log.Error("NUI", "application.Quit() !");
                 application.Quit();
             }
         }

src/Tizen.NUI/src/internal/Interop/Interop.WebView.cs

@@ -355,6 +355,9 @@ internal static partial class WebView
 
             [global::System.Runtime.InteropServices.DllImport(NDalicPINVOKE.Lib, EntryPoint = "CSharp_Dali_WebView_RegisterUserMediaPermissionRequestCallback")]
             public static extern void RegisterUserMediaPermissionRequestCallback(global::System.Runtime.InteropServices.HandleRef webViewRef, global::System.Runtime.InteropServices.HandleRef callbackRef);
+
+            [global::System.Runtime.InteropServices.DllImport(NDalicPINVOKE.Lib, EntryPoint = "CSharp_Dali_WebView_FeedMouseWheel")]
+            public static extern void FeedMouseWheel(global::System.Runtime.InteropServices.HandleRef webViewRef, bool yDirection, int step, int x, int y);
         }
     }
 }

src/Tizen.NUI/src/public/WebView/WebView.cs

@@ -3074,6 +3074,16 @@ public void WebAuthenticationCancel()
             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
         }
 
+        /// <summary>
+        /// Feed mouse wheel event forcefully.
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public void FeedMouseWheel(bool yDirection, int step, int x, int y)
+        {
+            Interop.WebView.FeedMouseWheel(SwigCPtr, yDirection, step, x, y);
+            if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
+        }
+
         internal static WebView DownCast(BaseHandle handle)
         {
             WebView ret = new WebView(Interop.WebView.DownCast(BaseHandle.getCPtr(handle)), true);