Add system control and reply queues to Amazon SQS transport

[jeremydmiller]

Summary

• Adds opt-in system queues (response and control) to the Amazon SQS transport, enabling request/reply mechanics (IMessageBus.InvokeAsync<T>()) and inter-node control communication
• Uses real SQS queues with tag-based orphan cleanup — queues are tagged with wolverine:last-active timestamps, a background timer refreshes tags every 2 minutes, and stale queues are cleaned up on startup
• Queue names are lowercased to prevent case mismatch between SQS (case-sensitive names) and URI normalization (which lowercases the host portion)
• Documents the new EnableSystemQueues(), EnableWolverineControlQueues(), and SystemQueuesAreEnabled() configuration methods

API

opts.UseAmazonSqsTransport()
    .AutoProvision()
    .EnableSystemQueues();           // enables request/reply
    // .EnableWolverineControlQueues(); // enables inter-node control (implies EnableSystemQueues)
    // .SystemQueuesAreEnabled(false);  // explicitly disable

Test plan

• All 19 buffered compliance tests pass (including can_request_reply, can_send_and_wait, explicit_respond_to_sender, requested_response)
• All 19 inline compliance tests pass
• All 19 durable compliance tests pass
• Full SQS test suite: 143 passed, 6 skipped (pre-existing), 0 failed

Closes #994

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