tikv: add raft applied_index in store heartbeat PeerReport #1235
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ref tikv/tikv#16717
After tikv/tikv#16626 it is possible that raft applied_index > max(committed_index, persisted). In this case, when do online unsafe recovery, it is better to let the peer has
max(applied_index, last_index)become leader so we can recover the maximum amount of data.