Export type ProduceJWT

[evan361425]

It is useful for type declaration:

function configJWT(jwt: ProduceJWT, config: Configuration) {
  // ...
}

const signJWT = new SignJWT(payload);
const encJWT = new EncryptJWT(payload);

// share for sign and encrypt
configJWT(signJWT, config);
configJWT(encJWT, config);