添加消息通知功能，使用Handy Control的Grow来实现的

Services/INotificationService.cs

@@ -0,0 +1,10 @@
+using PMSWPF.Enums;
+using PMSWPF.Models;
+
+namespace PMSWPF.Services;
+
+public interface INotificationService
+{
+    void Show(Notification notification);
+    void Show(string message, NotificationType type, bool IsGlobal);
+}