Merge pull request #3 from HueCodes/enhance-mesh-v2

[HueCodes]

This PR adds comprehensive HTTP/2 support and advanced service mesh features to
the Rust-ServiceMesh proxy, transforming it into a production-ready data plane
with modern protocol support, fault tolerance, and traffic management
capabilities.

Features Added

Protocol Support

• HTTP/2 with ALPN negotiation - Automatic protocol selection via TLS ALPN
• TLS termination - Rustls-based secure connections with modern cipher
  suites
• h2c support - HTTP/2 over cleartext for internal traffic
• Client TLS - Optional mTLS for upstream connections

Traffic Management

• L7 Routing - Path, header, and method-based routing with regex support
• Path rewriting - Dynamic URL transformation in routing rules
• Rate limiting - Token bucket algorithm with global and per-client limits
• Retry logic - Exponential backoff with jitter for transient failures

Load Balancing

• Multiple strategies - Round-robin, least connections, random, weighted
• Connection pooling - Efficient upstream connection management
• Health tracking - Circuit breaker integration for fault tolerance
• Automatic failover - Route to healthy endpoints only

Infrastructure

• Docker support - Multi-stage build with security best practices
• Performance benchmarks - Criterion-based benchmark suite
• Comprehensive docs - Architecture guides and usage examples
• CHANGELOG - Semantic versioning and release notes

Commits

1. e116451 - HTTP/2 and TLS support with ALPN negotiation
2. e8000ab - Token bucket rate limiting
3. b985eb2 - Retry logic with exponential backoff
4. f3830da - L7 routing and advanced load balancing
5. a84c9a4 - Docker support and performance benchmarks
6. c3a4456 - Comprehensive documentation and changelog

Testing

• All existing tests updated for new features
• Integration tests pass
• Benchmarks demonstrate performance characteristics
• Docker build completes successfully

Breaking Changes

None - This is additive functionality only. Existing HTTP/1.1 proxy
functionality remains unchanged.