asynchronized send timeout checking without pending queue lock #460
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Fixes #458
Motivation
For current producer, send timeout checking triggered by interval batch flush
If connection closed, the producer eventloop will blocked to reconnect to broker, lead to batch flush and send timeout checking take no effective, java-client timer did effective in this situation
Modifications
Asynchronized send timeout by running in independent goroutine until producer closed, and without a pending queue lock
Verifying this change
Others
Without pending queue lock, the send timeout checking gets more complicated, I don't know if it's worth it for performance.