Mark PSPDFKit-related code as obsolete

Added `[Obsolete]` attributes to classes, methods, and properties related to the deprecated PSPDFKit library and notifications.

- Marked `AnnotationHandler`, `DocStatusHandler`, `AnnotationBehavior`, and `DocStatusBehavior` as obsolete.
- Marked `Handle` methods in `DocStatusHandler` and `DocStatusBehavior` as obsolete.
- Marked `PsPdfKitAnnotation` property in `SignCommand` as obsolete.
- Marked `CreateOrUpdate` method in `AnnotationController` as obsolete.
- Added `Handle` methods in `DocStatusHandler` and `DocStatusBehavior` to send `CreateDocStatusCommand`.
- Updated `AnnotationController` dependencies to include `EnvelopeGenerator.Application.Common.Dto`.

These changes indicate a transition to `Signature.Commands.SignCommand` and deprecate PSPDFKit-related functionality.

EnvelopeGenerator.Application/Common/Notifications/DocSigned/Handlers/AnnotationHandler.cs

@@ -8,6 +8,7 @@ namespace EnvelopeGenerator.Application.Common.Notifications.DocSigned.Handlers;
 /// <summary>
 /// 
 /// </summary>
+[Obsolete("The PSPDFKit library is deprecated.")]
 public class AnnotationHandler : INotificationHandler<DocSignedNotification>
 {
     /// <summary>

EnvelopeGenerator.Application/Common/Notifications/DocSigned/Handlers/DocStatusHandler.cs

@@ -9,6 +9,7 @@ namespace EnvelopeGenerator.Application.Common.Notifications.DocSigned.Handlers;
 /// <summary>
 /// 
 /// </summary>
+[Obsolete("This notification is deprecated. Use Signature.Commands.SignCommand instead.")]
 public class DocStatusHandler : INotificationHandler<DocSignedNotification>
 {
     private const string BlankAnnotationJson = "{}";
@@ -30,6 +31,7 @@ public class DocStatusHandler : INotificationHandler<DocSignedNotification>
     /// <param name="notification"></param>
     /// <param name="cancel"></param>
     /// <returns></returns>
+    [Obsolete("This notification is deprecated. Use Signature.Commands.SignCommand instead.")]
     public Task Handle(DocSignedNotification notification, CancellationToken cancel) => _sender.Send(new CreateDocStatusCommand()
     {
         EnvelopeId = notification.EnvelopeReceiver.EnvelopeId,