Change paginated API query metadata to only be included in response if requested

[deekerno]

As part of the paginated query support implemented in #763, we automatically return a PageInfo object if a user sends a limit in their query. We should change the behavior to return the PageInfo object only if it is requested.

edit: Here's additional info.

During a sync with a member of the frontend team, they gave an example of a query that they would typically use:

query {
  transactions(first:10) {
    nodes {
      id
    }
    pageInfo {
      hasPreviousPage
    }
  }
  blocks(first:10) {
    nodes {
      id
    }
    pageInfo {
      hasPreviousPage
    }
  }
}

As you can see, this query specifically requests for the PageInfo metadata object to be returned. Upon clarification, they said that the front-end team would rather the PageInfo object only be returned if requested instead of how I originally implemented it (the current behavior is to return it for all paginated queries and it's unable to be specifically requested).

[ra0x3]

@deekerno This seems simple enough for me to handle if you prefer (also happy to let you have it if you have a certain way you'd like to see it implemented).

[deekerno]

Go for it! You should be able to look for the PageInfo object inside of Operation.parse(...) and then go from there. 👌🏽