Modify UnifiedSignature On-Chain for Revive Style ETH Account IDs

[p5150j]

Description

Update the UnifiedSignature process on-chain to support Revive style Ethereum account IDs, ensuring compatibility with the new key format.
Tasks

• Analyze current UnifiedSignature implementation
• Design modifications to support ETH account IDs
• Implement and test changes in test environment
• Update documentation for developers

Acceptance Criteria

• UnifiedSignature correctly handles Revive style ETH account IDs
• Backward compatibility maintained for existing signatures
• Documentation updated with new signature format details
• Successful testing in staging environment
• Deployment plan created for production

Engineering Notes

• Ensure that a newly created account does not need any extra mapping or additional step to be used directly in pallet-revive