feat(deployer): add service in maci repo

[NicoSerranoP]

Description

We are moving the coordinator service (built in NestJS) to the MACI protocol repository. This service allows users to deploy MACI and polls using a easy-to-use REST API service.

Pending

• [ ] Finish e2e tests to deploy MACI
• [ ] Finish e2e test to deploy a poll in a MACI instance

Related issue(s)

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.

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