Type checks in jackdaw.client namespace should check for the interface and not the concrete classes

[dfbernal]

Currently running into an issue were I'm trying to pass a MockProducer to the partitions-for function but the function is throwing the Got non producer/consumer! error. This is because MockProducer is not of type KafkaProducer but rather implements the Producer interface. I think if we change this type checking to be Producer instead then we'll have the ability to use Mocks along with jackdaw.

(instance? KafkaConsumer producer-or-consumer)
             (.partitionsFor ^KafkaConsumer producer-or-consumer topic-name)

(instance? KafkaProducer producer-or-consumer)
             (.partitionsFor ^KafkaProducer producer-or-consumer topic-name)