add CompareAndPutAll #559
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add CompareAndPutAll #559
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Motivation:
RheaKV 增加一个方法： compareAndPutAll
批量的原子更新(限于单 region 内，跨 region 不保证)，所有 key compare 成功时批量 put，只要有一个 key compare 不成功就全部失败