storage: add interfaces for copysets
Copysets significantly reduce the probability of data loss in the presence of multi node failures. The RFC for copysets is presented in https://github.com/cockroachdb/cockroach/pull/32816. This commit adds interfaces and protos for copysets. The implementation added later will have two independent tracks: 1. Assignment and persistance of store_id-copyset_id mapping. 2. Rebalancer changes to rebalance replicas into copysets. Release note: None
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