[feature]: `lncli printmacaroon`: add nonce to output

[ZZiigguurraatt]

lncli printmacaroon does not show the nonce used in the macaroon:

litd@charlie-69cdbb4746-q9z4m:/$ lncli printmacaroon $(lncli bakemacaroon peers:read peers:write)
{
    "version": 2,
    "location": "lnd",
    "root_key_id": "0",
    "permissions": [
        "peers:read",
        "peers:write"
    ],
    "caveats": null
}
litd@charlie-69cdbb4746-q9z4m:/$ 

I think we should show it because we have no way of distinguishing one macaroon from another with the same permissions.

If I put a macaroon into https://guggero.github.io/cryptography-toolkit/#!/macaroon , it gives me an output like

{
  "v": 2,
  "s64": "sx5iIqgqGlw8q6Ly5oJ_uGQipBDPPrBAQ2ezyvA4FJY",
  "i64": "AwoQccwvvjdwbeQ89YFu7IrbkRIBMBoUCgVwZWVycxIEcmVhZBIFd3JpdGU",
  "l": "lnd",
  "identifier_decoded": {
    "nonce": "71cc2fbe37706de43cf5816eec8adb91",
    "storageId": "30",
    "ops": [
      {
        "entity": "peers",
        "actions": [
          "read",
          "write"
        ]
      }
    ]
  }
}

which does include the nonce.

Note: https://guggero.github.io/cryptography-toolkit/#!/macaroon shows a storageId instead of a root_key_id. The difference seems to be that a 3 is prepended to every digit of the root_key_id. I'm not sure if this is a bug in https://guggero.github.io/cryptography-toolkit/#!/macaroon or if the root_key_id has a special encoding and storageId is a more general field used by macaroons that we happen to be putting root_key_id inside of.