[consensus] Implement parliament repository for multiple parliaments

[hihiboss]

Componet
consensus - pbft

Assignee
.

Proposal Detail
If you program multiple parliaments, we need a repository to save each parliament.
When there are multiple parliaments, state should be multiple. (Now state has a repository, but it's a singleton.)
If it goes like this, each parliaments and states can be modified like that they knows each other.

(Please progress this issue after beta release.)

다중 parliament를 구현할 경우, 각 parliament를 저장할 repo가 필요합니다!
또 parliament가 다수가 되면 state 역시 다수가 되야합니다. 이렇게 되면 각각의 parliament와 state의 짝이 잘 맞게 서로를 알고 있도록 parliament나 state가 수정될 수도 있겠네요!

(이 issue는 베타 출시 후 진행해주세요~)

Reference
#805 Feature/consensus/migrate leader api (Parliament)