Foundation for events to propagate notifications

BTCPayServer.Data/Data/NotificationData.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Data.Data
+{
+    public class NotificationData
+    {
+        public string Id { get; set; }
+        public DateTimeOffset Created { get; set; }
+        public string ApplicationUserId { get; set; }
+        public string NotificationType { get; set; }
+        public bool Seen { get; set; }
+        public byte[] Blob { get; set; }
+    }
+}