Being able of generating only source or sink connector

[oscerd]

There are cases in which only source or sink connector makes sense.

For example, for all the kubernetes connectors, it makes sense to have a source connector consuming events for a particular resource and send it to your kafka cluster, while it doesn't makes sense to have a sink connector creating kubernetes resources in your cluster (you can set an operation like describePod, listPods and so on, not really Kafkish).

So we may need to find a way of defining what to generate and what not.