Proper pause/resume support on Streams

[wolf4ood]

From OrientJS v.3 the returns of a query is a NodeJS streams, in order to support the new pagination feature of OrientDB 3.0.x. So it is possible to pause a stream and resume it later in time.

let stream = session
        .query("select from OUser", {
          pageSize: 1
        })

stream.on("data",console.log);

stream.pause();

setTimeout(()=> {
   stream.resume();
},1000)

This works fine, but still OrientJS, will request for the next page, if available, even if the stream is paused, that can result in high memory footprint due the records being cached in the stream buffer while the stream is in paused state.

OrientJS should not ask for the next page if the stream is paused.