[DO NOT MERGE] POC on reduce produce latency #470
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BUGS=LIKAFKA-53165
This PR is implemented based on https://docs.google.com/document/d/1oSsI7-9udDTnqlN293T-6ajokRr8eM93QIzuu6iA__c/edit#heading=h.hmogsghmufas.
After test with the fix the produce delay is still high during deployment. The explanations and more details can be found in: https://docs.google.com/document/d/1kH0oQrXThOcYt89y_HiCLAhQjuHoH9kq935ULYSgtU4/edit#heading=h.jukc2l4l0kpj