stream backpressure not handled well

see https://github.com/mariadb-corporation/mariadb-connector-nodejs/issues/161

Correction from CONJS-60 solve the connection hanging if any error occurs when handling results, but a the cost of not handling backpressure anymore.

This means that user have to take care of resuming query stream, that cannot be taken care of automatically. Choice was initially to have a good state whatever the situation, but this goes against stream feature to avoid charging memory.
Documentation can explicit this use case.