feat: expose information about rebalance events in th reader#1331

FilipeMCruz wants to merge 1 commit intosegmentio:mainsegmentio/kafka-go:mainfrom

FilipeMCruz:FilipeMCruz/expose-rebalance-eventsFilipeMCruz/kafka-go:FilipeMCruz/expose-rebalance-eventsCopy head branch name to clipboard