Feature: Hardhat task for voting in a deployed poll

[lordshashank]

Prerequisites

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Motivation

Been working on maci for some time in Privote, I feel that it would be good to have a task for voting in the poll we deploy through our tasks. One would be able to deploy, vote and then merge and prove to run complete deal flow directly from hardhat without needing of UI, etc to check it.

Details

I think we would just need script to vote in poll and then a task for this to implement complete poll flow through MACI.

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