Enhance UCEF extensions privacy

[zeluisping]

Adds private events and improves privacy controls for UCEF extensions by replacing standard OpenZeppelin modules with custom implementations that anonymize event emission and restrict event visibility.

✨ What's New

• ERC-4626 Vault Privacy: Standard Deposit and Withdraw events replaced with private events using _emitDepositEvent and _emitWithdrawEvent methods that emit PrivateEvent with restricted visibility to authorized viewers only
• Anonymous Pausing: UCEFPausable now inherits from AnonymousPausable instead of OpenZeppelin's Pausable, anonymizing the pause controller in event emissions
• Private Governance: UCEFVotes now inherits from PrivateVotes instead of OpenZeppelin's Votes, aligning voting logic with privacy requirements

🔧 Implementation Details

• Created AnonymousPausable utility that emits pause/unpause events with anonymized accounts and provides virtual hooks for customization
• Created PrivateVotes utility that provides private event emission for governance operations
• Implemented event viewer function pattern following the established UCEF pattern (_get*EventViewers) to determine which addresses can view each event

[zeluisping]

Fixed conflicts