add DocSignedNotificationStatusHandler and implement the natification into EnveloepControler

EnvelopeGenerator.Application/Common/Notifications/Handlers/DocSignedNotificationStatusHandler.cs

@@ -1,4 +1,7 @@
-using MediatR;
+using EnvelopeGenerator.Application.DocStatus.Commands;
+using EnvelopeGenerator.Domain.Constants;
+using MediatR;
+using Newtonsoft.Json;
 
 namespace EnvelopeGenerator.Application.Common.Notifications.Handlers;
 
@@ -7,15 +10,30 @@ namespace EnvelopeGenerator.Application.Common.Notifications.Handlers;
 /// </summary>
 public class DocSignedNotificationStatusHandler : INotificationHandler<DocSignedNotification>
 {
+    private readonly ISender _sender;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="sender"></param>
+    public DocSignedNotificationStatusHandler(ISender sender)
+    {
+        _sender = sender;
+    }
+
     /// <summary>
     /// 
     /// </summary>
     /// <param name="notification"></param>
-    /// <param name="cancellationToken"></param>
+    /// <param name="cancel"></param>
     /// <returns></returns>
-    /// <exception cref="NotImplementedException"></exception>
-    public Task Handle(DocSignedNotification notification, CancellationToken cancellationToken)
+    public async Task Handle(DocSignedNotification notification, CancellationToken cancel)
     {
-        throw new NotImplementedException();
+        await _sender.Send(new SaveDocStatusCommand()
+        {
+            Envelope = new() { Id = notification.EnvelopeId },
+            Receiver = new() { Id = notification.ReceiverId},
+            Value = JsonConvert.SerializeObject(notification.Annotations, Format.Json.ForAnnotations)
+        }, cancel);
     }
-}
+}