PgamSSP adapter : add GVL ID

[chicoman25]

Merged changes from Go adapter: prebid/prebid-server#4056

% curl https://vendor-list.consensu.org/v3/vendor-list.json | jq '.vendors."1353"'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  652k  100  652k    0     0  2744k      0 --:--:-- --:--:-- --:--:-- 2753k
{
  "id": 1353,
  "name": "PGAM Media LLC",
  "purposes": [
    1,
    3,
    4,
    5,
    6,
    7,
    8,
    9,
    10
  ],
  "legIntPurposes": [],
  "flexiblePurposes": [],
  "specialPurposes": [
    3
  ],
  "features": [
    3
  ],
  "specialFeatures": [
    1
  ],
  "cookieMaxAgeSeconds": 1209600,
  "usesCookies": true,
  "cookieRefresh": true,
  "urls": [
    {
      "langId": "en",
      "privacy": "https://pgammedia.com/privacy-policy/",
      "legIntClaim": "https://pgammedia.com/privacy-policy/"
    }
  ],
  "usesNonCookieAccess": false,
  "dataRetention": {
    "stdRetention": 14,
    "purposes": {
      "8": 11
    },
    "specialPurposes": {
      "3": 30
    }
  },
  "dataDeclaration": [
    1,
    2,
    8
  ],
  "deviceStorageDisclosureUrl": "https://pgammedia.com/devicestorage.json"
}

[Net-burst]

PBS Java uses different syntax. Should be vendor-id. It's already present in the yaml file, just set to 0 right now.

[chicoman25]

Good catch. I've made the adjustment to vendor-id and removed gvlVendorID