jamie/kafka calls

[jamiealquiza]

kafkazk library

• Adds a KIP-455 compatible ListReassignments call
• Adds the GetTopicMetadata call for fetching v3 topic metadata
• Splits types and errors out of the zookeeper.go file

general changes

• Kafka 2.8 in the Docker compose setup
• Revised Kafka listeners configuration

todo

• Test coverage for GetTopicMetadata
• Test coverage for ListReassignments

[dopuskh3]

Should we have a Reassignment struct that contains the reassignment for only one topic? It's sort of weird for TopicMetadata to hold a kv struct where the only key is the current topic name because TopicMetadata is already bound to a topic.

[jamiealquiza]

That's because Reassignments is a pre-existing type; this method is to translate the new type TopicMetadata (which belongs to a single topic) to a Reassignments. In the ListReassignments call, we get a TopicMetadata->Reassignments for all topics, merge them into a single Reassignments.