Prototype an update to Catalyst V2 APIs

@mark,

This is a carry over from ParaView discourse exchange we had a few months ago. I wasn't able to technically work on the stub I created back then, but I would like to now return to this project and make some progress this calendar year. Moreover, we are working to secure backing from our current research programme for a 9month demo project which will cover half of my time and another colleague from UKRI. The objective is to adapt work-flows in both organisations to use in-situ and evaluate their performance on both cloud and on-prem instances.

This message is just to gauge your interest. At this stage, I am only asking whether you would like to see any scaling or performance analysis results we may come up with.

Also, I have read your blog post and in the long run we would like to be able to contribute to visualisation module (if we develop anything worth contributing of course).