feat(zkatsnark): add driver module for zkatsnark

[neetance]

Description

This PR introduces the driver module for the zkatsnark token backend, effectively wiring up the core Panurus token interfaces (TokenDriver, ValidatorDriver, WalletServiceFactory) to our new zk-SNARK cryptographic primitives. The architecture mirrors the existing zkatdlog driver implementation to ensure consistency across the codebase.

Changes included

• Driver Registration (driver.go): Implements NewTokenDriver and NewTokenService to orchestrate and export the zkatsnark capabilities as a factory, registered under the zkatsnark driver name and v1 version.
• Component Factories:
  • ppm.go: Implements the PublicParametersManager factory.
  • ws.go: Implements the WalletServiceFactory adapted for zkatsnark identities and roles.
  • validator.go: Instantiates the zkatsnark-specific validator utilizing the groth16 proof system.
  • deserializer.go: Wires the identity deserialization logic supporting Idemix, X.509, multisig, and HTLC identities.
• Core Service Stubs:
  • Created initial stubs for service.go, issue.go, transfer.go, and auditor.go to satisfy the TokenManagerService composition requirements. These encapsulate the core action logic (Issue/Transfer/Audit) and will be fully implemented in a follow-up PR alongside the prover orchestrator.

Next step

• Implement TokenTypeCommitment as part of an action instead of encoding raw token type bytes.