- Added IPReputationChecker class for checking and caching IP reputation scores.
- Introduced IReputationResult interface and ReputationThreshold enum for reputation scoring.
- Implemented DNSBL checks and IP information retrieval within the IP reputation checker.
- Created SecurityLogger class for logging security events with various log levels and event types.
- Defined ISecurityEvent interface for structured logging of security events.
- Updated index.ts to export new classes and types for security module.
