feat(websocket): enhance resilience with backoff and cancellation sup…

[Praying]

…port

• Implement exponential backoff configuration with jitter for reconnection
• Add CancellationToken support for graceful operation cancellation
• Introduce event callback registration for connection lifecycle monitoring
• Add subscription capacity management with max subscription limits
• Implement graceful shutdown with timeout and resource cleanup
• Create AutoReconnectCoordinator for automatic reconnection handling
• Add Cancelled and ResourceExhausted error types with helper methods
• Update Binance test configurations to use .into() for credential conversion
• Add tokio-util dependency for cancellation token functionality