Consensus API

Status	NOT STARTED
Stakeholders	武宮誠 Andrei Lebedev Egor Ivkov Kamil Salakhiev Михаил Болдырев
Outcome
Due date	11 Sep 2020
Owner	Nikita Puzankov

Background

This RFC is out-of-scope Iroha 2.0.0.

Initial idea is to define loosely coupled API for `Consensus`. This way Iroha will be able use not only Sumeragi as a consensus algorithm.

It will be better to use some standards here, dor example: https://github.com/hyperledger/sawtooth-rfcs/blob/master/text/0004-consensus-api.md