todo block을 넣어야함todo test.

todo test.

todo test.

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todo test.

tested.

tested.

Temporary Function.

.

todo test.

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Same with `committed-local` stage explained in the original paper.

Same with `prepared` stage explained in the original paper.

The ReqMsgs is processed successfully.

consesnsus message can has 3 types.

동시에 여러개의 consensus가 진행될 수 있다.한개의 consensus는 1개의 state를 갖는다.

현재 Consensus에 참여하는 leader와 peer정보.