[ISSUE #1049] [Rust] Add heartbeat health check API to Client #1050
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Which Issue(s) This PR Fixes
[ISSUE #1049] [Rust] Add heartbeat health check API to Client
Brief Description
Add a heartbeat health check API to the RocketMQ Rust client.
Expose is_heartbeat_healthy(), Producer, and SimpleConsumer to allow applications to check if the client maintains a healthy heartbeat with the broker. Heartbeat status is updated periodically by the client background task.
How Did You Test This Change?
Added and updated unit tests to verify the heartbeat health check logic in Client.
Manually validated that the health status reflects heartbeat success and failure scenarios.