test raft cluster by python

[happy-v587]

Which PikiwiDB functionalities are relevant/related to the feature request?

raft

Description

基于规则的方式，编写raft cluster测试case。比如

• set 一些 key，然后做了raft log compact、add node、kill leader，最后 get key验证数据是否正确
• 多节点运行，将其中一个节点ctrl + z，然后写大量数据，然后取消ctrl + z，验证数据是否正确
• 批量 add 很多 node，然后 set/get key 看看结果是否符合预期
  等

Proposed solution

详细可见：#273 (comment)

Alternatives considered

使用go、shell也都可以。主要是实现类似的测试case

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Title: Test: raft cluster supports python script testing