Reliable enqueue over an unreliable network

Implement enqueue_with_retry(queue, payload, max_attempts=5, base=0.01, cap=0.1): - call queue.put(payload); ConnectionError means the attempt failed - between attempts, the backoff ceiling min(cap, base * 2**attempt) must be computed (you may sleep or not — tests measure calls, not time) - succeed → return attempts_used (1-based) - exhaust all attempts → raise RuntimeError whose message contains 'exhausted' queue may be any object with .put — the test uses one that fails a fixed number of times then succeeds.

Difficulty: advanced