KAFKA-9010: Add PartitionGrower, Support partition requery in ProduceBench test.

[scott-hendricks]

This creates a test in trogdor to grow a topic at a specified interval by a specified number of partitions.

This test also introduces the ability for the ProduceBench test workload to requery the partitions of the active topics at an interval, if so desired. If no query interval is specified, the default behaviour of ProduceBenchWorker remains unchanged.

[stanislavkozlovski]

I have been thinking about the PartitionGrower and spec bloat in general.

There are many cases where it would be useful to run workers that do one-off things (create topics, delete topics, add configs) and all of those operations are AdminClient-based.

My suggestion is we invest the time now and come up with a generic AdminClientSpec/Worker that would lay the foundation for one-off tasks. As it is right now, we would have it support growing the partitions of a topic.
If we do not go this route, we will likely need to introduce a different spec for each different one-off task. This will duplicate a lot of logic and we will ultimately end up with more boilerplate, less readable code and a harder to use API

[scott-hendricks]

I have addressed all code comments. As for the AdminClientSpec/Worker classes Stan mentioned, I would argue that would just add complexity. If anything I would think we may want to create a new folder for these types of tests if they become popular, but for now I don't see why they shouldn't be treated like any other Trogdor test.