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.Web/Controllers/AnnotationController.cs

@@ -1,5 +1,6 @@
 using DigitalData.Core.Abstraction.Application.DTO;
 using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Extensions;
 using EnvelopeGenerator.Application.Common.Interfaces.Services;
 using EnvelopeGenerator.Application.Common.Notifications.DocSigned;
@@ -46,6 +47,7 @@ public class AnnotationController : ControllerBase
 
     [Authorize(Roles = Role.ReceiverFull)]
     [HttpPost]
+    [Obsolete("This notification is deprecated. Use Signature.Commands.SignCommand instead.")]
     public async Task<IActionResult> CreateOrUpdate([FromBody] PsPdfKitAnnotation? psPdfKitAnnotation = null, CancellationToken cancel = default)
     {
         // get claims