User Query does not include the roles

[ben181231]

When querying user using user:query, currently the response does not include the user's roles:

{
  "result": [
    {
      "data": {
        "_id": "cd612328-3cf3-421f-af0e-474e06f6a9ac",
        "email": "user4@skygear.dev",
        "username": ""
      },
      "id": "cd612328-3cf3-421f-af0e-474e06f6a9ac",
      "type": "user"
    }
  ]
}

[royuen]

• Change user query to be only called by admin
• Return user role as well