Add ability to deploy maci instance

[0xmad]

As coordinator I'd like to deploy maci instance inside maci-rpgf

• [x] Use deploy procedure from maci-contracts or maci-cli
• [ ] Handle errors
• [ ] Support client transaction signing (check if it's possible)
• [ ] Add ui for maci instance deployment

[kittybest]

also:

• add configuration fields:
  • approval schema for EASGatekeeper: we could decide if we want the coordinator to insert here, or just grab this information from environmental variable
  • default voice credit amount: since we are going to use the ConstantVoiceCreditProxy, I think it's better to let the coordinator decide the amount?
  • attester: could be optional, default the coordinator, but might be required in the future? for example, I am the coordinator, but I might also want users who have attestation from optimism to be able to signup for maci?