graphql: add storage slots to access list

[holiman]

I'm not really certain why it didn't work previously, but for some reason, this fixes it.

$ cat query.json 

{"query":"query getAccessList($blockNumber: Long = 5000628) { block(number: $blockNumber) {  transactionAt(index: 71) { accessList { address storageKeys } }  }}","variables":null,"operationName":"getAccessList"}

Without this PR:

curl -X POST 'http://localhost:8545/graphql' -H 'Content-Type: application/json'  --data @query.json | jq . 
{
  "data": {
    "block": {
      "transactionAt": {
        "accessList": [
          {
            "address": "0x57b96462b8d236cfec75dc9c0e0dcee20a22a7dd",
            "storageKeys": []
          },
          {
            "address": "0xb4fbf271143f4fbf7b91a5ded31805e42b2208d6",
            "storageKeys": []
          },
          {
            "address": "0x4774be14b1e81eb9f78f5d58b061f796fb2c744f",
            "storageKeys": []
          }
        ]
      }
    }
  }
}

With this PR:

$ curl -X POST 'http://localhost:8545/graphql' -H 'Content-Type: application/json'  --data @query.json | jq . 
{
  "data": {
    "block": {
      "transactionAt": {
        "accessList": [
          {
            "address": "0x57b96462b8d236cfec75dc9c0e0dcee20a22a7dd",
            "storageKeys": [
              "0x0000000000000000000000000000000000000000000000000000000000000006",
              "0x0000000000000000000000000000000000000000000000000000000000000007",
              "0x0000000000000000000000000000000000000000000000000000000000000008",
              "0x0000000000000000000000000000000000000000000000000000000000000009",
              "0x000000000000000000000000000000000000000000000000000000000000000a",
              "0x000000000000000000000000000000000000000000000000000000000000000c"
            ]
          },
          {
            "address": "0xb4fbf271143f4fbf7b91a5ded31805e42b2208d6",
            "storageKeys": []
          },
          {
            "address": "0x4774be14b1e81eb9f78f5d58b061f796fb2c744f",
            "storageKeys": []
          }
        ]
      }
    }
  }
}

[karalabe]

al := al would also fix it

[fjl]

Would be even better to change the type of AccessTuple.storageKeys to non-pointer.

[holiman]

fixed, PTAL