feat(swarm): add retry logic, exponential backoff, and multi-connection support

[bomanaps]

Description

Summary

Add retry logic, exponential backoff, and multi-connection support to Swarm in libp2p/network/swarm.py.

Motivation

Motivation

• Current Swarm implementation retries are limited and can fail under unstable network conditions.
• Lacking multi-connection support leads to reduced fault tolerance and load balancing.
• Enhancements will improve reliability, scalability, and production readiness.

Requirements

Retry Logic with Exponential Backoff

• Configurable retry attempts
• Jitter to prevent synchronized retry storms
• Robust exception handling

Multi-Connection Support

• Connection pooling with deduplication
• Load balancing (round-robin, least-loaded)
• Graceful fallback to single-connection mode

Connection Pool Management

• Automatic trimming and cleanup
• Health tracking
• Async lifecycle management

Open questions

No response

Are you planning to do it yourself in a pull request ?

Yes