Return question scores and recalculate

[c-j-johnston]

Fixes #1671.

In line with PASTEL in PaS, return all scores for all questions when PASTEL is run, and add a function to recalculate these scores. Also refactored location of some models.

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[dcorney]

Looks good, just a couple of questions about the tests.
Is this still compatible with genai_checkworthy?

[dearden]

I think the changes look fine. I didn't look in depth at a lot of the code I assume had been brought over from pas.

One thing I will say is that some functions are now asynchronous that formerly weren't. That means in demo scripts they need to be run as asyncio.run. Worth double checking if that will have any knock-on on checkworthy too.