Queryable receiving replies through a Handler.

Example using the default receiver:

try (Session session = Zenoh.open(config)) {
    Queryable<BlockingQueue<Optional<Query>>> queryable = session.declareQueryable(keyExpr);
    BlockingQueue<Optional<Query>> receiver = queryable.getReceiver();
    while (true) {
        Optional<Query> wrapper = receiver.take();
        if (wrapper.isEmpty()) {
            break;
        }
        Query query = wrapper.get();
        query.reply(query.getKeyExpr(), "Example reply");
    }
}