Query response object (API change)

[alonsovb]

Feature request

Currently, the Presto client returns a simple object for the data retrieved from the Presto server.

With the JSON parsing that includes BigInt, now it's a bit more inconvenient just serializing the response with a JSON.stringify. So we should think about some kind of API, with a wrapper object for the response that allows easier serializing (something like response.toString() or response.text()) and retrieving the raw data. It could include retrieving by column name, etc.