Update server output format

[mwisner]

Hi,

I'm totally new to persisted queries, but I was doing some research and noticed that at least according to this document: https://www.apollographql.com/docs/kotlin/v5/advanced/persisted-queries

The persisted query manifest looks something like:

{
  "format": "apollo-persisted-query-manifest",
  "version": 1,
  "operations": [
    {
      "id": "e0321f6b438bb42c022f633d38c19549dea9a2d55c908f64c5c6cb8403442fef",
      "body": "query GetItem { thing { __typename } }",
      "name": "GetItem",
      "type": "query"
    }
  ]
}

however this package generates it as:

{
  "format": "apollo-persisted-query-manifest",
  "version": 1,
  "operations": {
    "e0321f6b438bb42c022f633d38c19549dea9a2d55c908f64c5c6cb8403442fef":  {
      "body": "query GetItem { thing { __typename } }",
      "name": "GetItem",
      "type": "query"
    }
  }
}