- Simplify asymmetric encryption by using a single symmetric key
instead of deriving a key from an ephemeral key exchange. This
improves clarity and reduces complexity.
- The new implementation encrypts the symmetric key with the
recipient's public key and then encrypts the message with the
symmetric key.
- Improve test coverage for asymmetric encryption/decryption.
- Moved `prepare_function_arguments` and `convert_token_to_rhai` to the `ethereum` module for better organization.
- Updated `keypair` module to use the new `session_manager` structure improving code clarity.
- Changed `KeyPair` type usage to new `vault::keyspace::keypair_types::KeyPair` for consistency.
- Improved error handling and clarity in `EthereumWallet` methods.
