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* feat: add exists api into KvBackend * refactor: region lease * feat: fiter out inactive node in keep-lease * feat: register&deregister inactive node * chore: doc * chore: ut * chore: minor refactor * feat: use memory_kv to store inactive node * fix: use real error in * chore: make inactive_node_manager's func compact * chore: more efficiently * feat: clear inactive status on cadidate node