[Fix] Fix the key-based batch can't guarantee the ordering when flushing #1252
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Motivation
When using key-based producing, the key-based batcher cannot guarantee the sequence ID order when flushing messages. This leads to frequent disconnections between the client and the broker, resulting in poor performance.
Here is the related log:
The broker receives unordered messages and returns a SendError to the client. This causes the client to reconnect to the broker.
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