Add pause, paused and resume to jackdaw/client.

[kidpollo]

Great for on the fly updating what topics are being listened to by the consumer.

https://kafka.apache.org/21/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#pause-java.util.Collection-

https://kafka.apache.org/21/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#paused--

https://kafka.apache.org/21/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#resume-java.util.Collection-