Adding some params to make the integration tests execute faster

[hgm-king]

@morukele I made some small tweaks, the consumers and producers can receive options that will let them produce and consume in bigger batches, which makes the tests go a lot faster.

@dhonig we need to think about what good defaults would be for these.

[morukele]

@hgm-king This makes sense, when you merge, I will pull it into my own fork.