refactor ConsumerMetadataReq/Resp -> FindCoordinatorReq/Resp #1010
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As part of
KIP-98
and for the impl of the transactional producer theGroupCoordinatorRequest
/ConsumerMetadataRequest
has been renamedFindCoordinatorRequest
and now serves the dual purpose of both looking up consumer group and transaction coordinator.This PR moves the logic to
FindCoordinatorRequest
, transitionsgetConsumerMetadata
to useFindCoordinatorRequest
, and provides transparent backwards compatibility for theConsumerMetadataRequest
.