Implementing PinotClientTransport using Vert.x

Hi! I are trying to implement the PinotClientTransport interface as a part of creating a Vert.x Client adapter for the Pinot client. There are two changes we have identified so far that can help move in that direction.
1. https://github.com/apache/pinot/pull/10326
2. Making [BrokerResponse](https://github.com/apache/pinot/blob/master/pinot-clients/pinot-java-client/src/main/java/org/apache/pinot/client/BrokerResponse.java) a public class. Currently its package private but the public interface of PinotClientTransport returns it from the executeQuery and executeQueryAsync methods making it impossible to implement the interface externally.