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The management API group already has CreateTopic API. This pull request is to implement DeleteTopicAPI. The implementation is based on official documentation https://kafka.apache.org/protocol#The_Messages_DeleteTopics. I choose API version 0 because, in the newest version, which is 1, the only difference is
throttle_time_ms
field and it seems like we don't have a proper way to handle throttling. Therefore, the version 0 is safer.