Inject an operation into Jstz

Example request

{
  "inner": {
    "content": {
      "functionCode": "export default (request) => new Response('Hello world!')"
    },
    "publicKey": "edpkukK9ecWxib28zi52nvbXTdsYt8rYcvmt5bdH8KjipWXm8sH3Qi"
  },
  "signature": "edsigtpe2oRBMFdrrwf99ETNjmBaRzNDexDjhancfQdz5phrwyPPhRi9L7kzJD4cAW1fFcsyTJcTDPP8W4H168QPQdGPKe7jrZB"
}