* Handle nested `topicData` in `representProduceRequest`

* Handle nested `topics` in `representCreateTopicsRequest` and `representCreateTopicsResponse`

* Handle nested `responses` in `representProduceResponse`

* Handle nested `topics` in `representFetchRequest` and nested `responses` in `representFetchResponse`

* Introduce `ignoreKeys` argument to `representMapAsTable` and ignore the keys based on that argument

* Bring back the `nil` checks