Selector can make use of JDK 11 zero copy NIO select

JDK 11 has introduced zero copy select ie https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/channels/Selector.html#select(java.util.function.Consumer) that can be used to reduce the amount of GC created by Selector::poll.

It would be nice to access these new methods without impacting on the currently supported JDK version ie 8: MethodHandler::invokeExact seems a good candidate to do it.