Add ZKJWTUtils

[ernestognw]

Similar to #96 but for ZK JWT

[ernestognw]

Getting a:

Error HH411: The library solidity-stringutils, imported from @zk-email/zk-jwt/src/utils/JwtRegistry.sol, is not installed. Try installing it using npm.

It may be worth to submit a pr to ZK JWT to replace this library with OZ if possible. Most likely using the Bytes library

[ernestognw]

It seems ready imo. I couldn't get the testInvalidJWTProof to pass. It'll always revert with fuzzing. It seems that this comes from differences between the JwtGroth16Verifier used under the hood vs the Groth16Verifier used for ZKEmail.

I think we should discuss whether how to remove the try/catch block in isValidZKJWT or also add it to isValidZKEmail

[ernestognw]

Next steps include:

1. Generate a real proof fixture to test against
2. Create a SignerZKJWT
3. Create a ERC7913ZKJWTVerifier

For 1, I've been trying to run the following on the zk-jwt repository and I can't generate a proof, only the public inputs:

yarn gen-input --input-file input.json --account-code "0x1162ebff40918afe5305e68396f0283eb675901d0387f97d21928d423aaa0b54" --prove

[ernestognw]

I think we should discuss #210 first. I'd like to port those changes to ZKJWTUtils as well but first we need to validate that dropping templateId is actually fine