feat: add the relayer

[filoozom]

The relayer will act a centralized component for now to very RLN proofs from GO tokens and post a message on chain if verification works. This has to be done right now because the tech to do it in a smart contract doesn't exist yet, but there's a clear path towards decentralization at least.

Todo:

• [x] Finish the API routes
• [x] Do the contract call now that #288 landed

To be addressed in following PRs:

• [ ] Improve security checks on proofs (internalNullifier === "kurate", epoch are in the same 8 hour interval, move the merkle tree root check to verifyProof)
• [ ] Make routes more generic (shared verification logic)
• [ ] Add tests

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Name	Status	Preview	Comments	Updated (UTC)
kurate	❌ Failed (Inspect)			Apr 4, 2023 11:45am

[filoozom]

It should now theoretically be possible to use this API to post message to the contract, assuming the .env file is configured correctly.

It's not entirely done though. I updated the todo in the initial message.

[filoozom]

Indirectly merged in #357, missing todos will be addressed separately.