Create DNS Server with Advanced Caching and Security

[shivas1432]

Implement a DNS server with intelligent caching, security features, and performance optimization.

Core Features:

• DNS query processing
• Resource record management
• Zone file parsing
• Recursive and iterative queries
• Authority delegation

Caching System:

• Intelligent cache management
• TTL-based expiration
• Cache warming strategies
• Negative caching
• Cache poisoning protection

Security Features:

• DNSSEC validation
• DNS over HTTPS (DoH)
• DNS over TLS (DoT)
• Query filtering and blocking
• Rate limiting

Performance:

• Load balancing
• Geographic routing
• Anycast support
• Connection pooling
• Async processing

Files to Create:

• projects/advanced/dns-server/
• projects/advanced/dns-server/cache/
• projects/advanced/dns-server/security/
• projects/advanced/dns-server/README.md