feat: introduce MultiSigContractV2 with enhanced governance and security foundations

[SynnekOG]

PR Description

Summary

This PR lays the groundwork for the MultiSigContractV2, an upgraded multisig contract designed with security, extensibility, and governance in mind. The contract leverages OpenZeppelin security patterns and integrates attestation-based features for advanced use cases.

Changes

• Created MultiSigContractV2.sol
  • Added SPDX license and pragma declaration.
  • Imported essential dependencies:
    • OpenZeppelin: Ownable, ReentrancyGuard, Pausable, EnumerableSet.
    • FactoryTokenContract for token interactions.
    • SignProtocol (ISP, Attestation, DataLocation) for on-chain attestation support.
  • Defined contract inheritance from Ownable, ReentrancyGuard, and Pausable.
  • Added comprehensive Natspec comments including:
    • Contract title
    • Author
    • Description of features and intended enhancements (timelock, emergency functions, role management, attestations).

Impact

• Establishes a solid foundation for building a feature-rich multisig contract.
• Ensures best practices by integrating OpenZeppelin security utilities from the start.
• Prepares for future extensions like timelock execution, attestation-based validations, and emergency governance controls.

Next Steps

• Implement multisig signer management (add/remove signers, quorum thresholds).
• Add timelock functionality for queued transactions.
• Introduce emergency controls (pause/unpause, restricted admin actions).
• Integrate attestation verification for advanced governance logic.
• Write unit tests for signer logic and initial setup.