KAFKA-12779: KIP-740, Clean up public API in TaskId and fix TaskMetadata#taskId()#10735

ableegoldman merged 3 commits intoapache:trunkapache/kafka:trunkfrom

ableegoldman:12779-clean-up-TaskId-and-return-on-TaskMetadataableegoldman/kafka:12779-clean-up-TaskId-and-return-on-TaskMetadataCopy head branch name to clipboard