add worklow_id to authorworklow create

[DonHaul]

This route: https://github.com/inspirehep/inspirehep/blob/master/backoffice/backoffice/authors/api/views.py#L97

is returning things such as

{
  "data": {
    "name": {
      "preferred_name": "TESTSSS",
      "value": "TEST, Test"
    },
    "_collections": [
      "Authors"
    ],
    "$schema": "https://inspirehep.net/schemas/records/authors.json"
  },
  "workflow_type": "AUTHOR_CREATE"
}

it will be useful for it to also have workflow_id.