feat: Snapshot save & load #238
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1 、增加了 snapshot save 和 snapshot load 。
1）在 save_snapshot 中, 持有 Storage 读锁的情况下, 创建 chenckpoint 并保存在 braft 指定的 snaoshot 目录下.
2）snapshot_load 中, 持有 Storage 写锁的情况下, 将 checkpoint 中的数据拷贝一份到 DB 目录中, 并重新打开 DB. (对于 sst 文件，创建 hard link ，其他文件，copy).
3）、实验: 提拱了 save_load.sh 运行之后检查 leader 和 follower 文件的数据是否符合预期。
2、提供了 DOSNAPSHOT 命令, 手动触发 barft 创建快照.