Feat: voice credit per tokens (ERC20 or ETH sent to an address)

[NicoSerranoP]

Description

We need a feature to give each voter a specific voice credit amount depending on how much ERC-20 tokens or ETH the user has send to an address. Related to https://github.com/privacy-scaling-explorations/maci/issues/1968

Steps:

1. Deploy the PerTokenVoiceCreditProxy contract
2. Send ERC20 tokens or ETH to the contract using registerVoiceCredits (this is happening outside any Poll or MACI function. Should it stay that way or should we integrate it into the joinPoll step?)
3. Vote into a specific poll. The contract will use getVoiceCredits to calculate how much credit a voter has

Related issue(s)

Close #1968

Confirmation

[!IMPORTANT] We do not accept minor grammatical fixes (e.g., correcting typos, rewording sentences) unless they significantly improve clarity in technical documentation. These contributions, while appreciated, are not a priority for merging. If there is a grammatical error feel free to message the team.

• [X] I have read and understand MACI's contributor guidelines and code of conduct.
• [X] I ran and verified that all tests pass according to MACI's testing guide.

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[ctrlc03]

please rebase to dev