Revised FinalizeEnvelopeCommand to notify each receiver
individually instead of converting documents to Base64.
Adjusted IsActive method in EnvelopeStatusExtensions to
include EnvelopePartlySigned as active. Updated project
version to 1.7.0-beta to reflect these changes.
Replaced PKCS#11-based cryptographic operations with a new DocumentService API integration. Removed all PKCS#11-related code, configurations, and dependencies, including options, self-test status, and signing logic. Updated `FinalizeEnvelopeCommand` to include a notification service and added base64 conversion for documents. Updated `ServiceCollectionExtensions` to register the new DocumentService client. Removed outdated documentation and diagrams related to PKCS#11. Updated project files and configurations to reflect these changes and incremented the version number. Added a comment in `EnvelopeFinalizationWorker` for future RabbitMQ integration.
