CAMEL-14250: Allow custom configurations into Kafka component

[omarsmak]

My first PR after my holidays and to kick my brain on again :).

Per CAMEL-14250, this will add new optional called additionalProperties. to Kafka component to allow properties that are not covered by KafkaConfigurations

[davsclaus]

I wonder if we can also add this to the component level, so you can configure these globally too for all your kafka endpoints. And then on endpoint level they can be there too, so you can override or provide extra there too.

[omarsmak]

I thought about it at first actually but then if it can be set from KafkaConfiguration which eventually means can be set from the component level, I thought that would be enough. However, currently this is not going to work because I have missed to add a check if it was already set on the component level otherwise set it on the configuration. Thanks for the reminder

[omarsmak]

@davsclaus did some modification to make additionalProperties through KafkaConfiguration on the component level aware as it wasn't before