[perf] Support batch index ACK and max number of messages in batch #967
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Motivation
Currently, the perf tool does not support the maximum number of messages in batch for producer and batch index ACK for consumer.
Modifications
--batching-max-size
option to configure the maximum number of messages for producer--batching-max-size
config fromint
touint
--enable-batch-index-ack
option to enable batch index ACK for consumer.