Expand Voting in 4-voting

[alexroan]

AnonymousBallot is crude atm. Things to improve:

• [ ] Instead of using prepare.sh script, Verifier.sol and anything else awkwardly inherited from the https://github.com/TheBojda/zk-merkle-tree/tree/main repo, use hardhat-circom.
• [ ] Dynamic tree height instead of the default 20. This will generate a new Verifier contract every time it's changed.
• [ ] Addresses that are able to register for votes are based on an external call to an AllowList contract.
• [ ] Support multiple rounds/proposals (This will require rolling base contracts into implementation contracts so that previous round commitments are not used in new rounds)
• [ ] Use Foundry and FFI instead of Typescript for test cases

[alexroan]

Moved this directory to a new repo: https://github.com/alexroan/anonymous-ballot