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To make sure we could recover from broker failure/leader transition, an in-memory member name map is not enough. We will init another topic called `static_member_map` in the cluster and each time we have a stable state we should write the complete mapping information as a single message into it. We could otherwise reuse the `_consumer_offsets` topic to store this information, which however could be unfavorable if we are making too many changes to existing offset message schema. Either way when another broker takes over the leadership, we could transfer the mapping together.

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Admin APIs for membership management

For the very first version, we hope to make membership transferring logic and human handling simple enough. We will define three admin APIs to help us better manage the groups:

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