- Introduced Lazy<dynamic> field for deferred deserialization of PSPDFKitInstantJSON
- Added ExpandoObject property (PSPDFKitInstant) for dynamic access
- Updated handler to use ParsePSPDFKitInstant instead of ParsePSPDFKitInstantJSON
- Improved JsonSerializerOptions for case-insensitive property handling
Added full implementation for CreateAnnotationCommand and its handler:
- Introduced `PSPDFKitInstantJSON` property to the command
- Injected repositories for `Signature` and `Annotation`
- Implemented query filtering for Envelope and Receiver
- Added annotation creation from parsed PSPDFKit JSON
- Created helper method `ParsePSPDFKitInstantJSON` for JSON parsing