Improve Validator Management with Redis and IP Location Lookup

[shivam-ross]

Change made :

• Replaced in-memory validator tracking with Redis for better persistence across restarts.
• Added IP location lookup using ip-api.com to enhance validator metadata.
• Implemented WebSocket tracking in Redis for efficient validator reconnections and queue management.
• Updated the validation request distribution to use Redis queue operations (rpoplpush) for better load balancing.
• Refactored signupHandler to use Redis for state management.