- Add `signature_data` field to `ContractSigner` to store base64
encoded signature image data. Allows for storing visual
signatures alongside electronic ones.
- Implement `sign` method for `ContractSigner` to handle signing
with optional signature data and comments. Improves the
flexibility and expressiveness of the signing process.
- Add Rhai functions for signature management, including signing
with/without data and clearing signature data. Extends the
Rhai scripting capabilities for contract management.
- Add comprehensive unit tests to cover the new signature
functionality. Ensures correctness and robustness of the
implementation.
- Update examples to demonstrate the new signature functionality.
Provides clear usage examples for developers.
