title: Spring Cloud Stream dynamic destination partitionCount property
body: <p>I would like to use the <code>BinderAwareChannelResolver</code> bean in order to send message to Kafka with a topic name that is resolved on runtime.
  My problem is that the <code>partitionCount</code> in the <code>BindingProperties</code> of this topic defaults to 1. <br> This value does not reflect the true number of partitions when this topic already existed in Kafka and also when this topic is created by the client (with partition count equal to the <code>minPartitionCount</code> configuration value). <br>
  How can I make this property reflect the true number of partitions?</p>