Updating make-me-say to be compatible with Solvers

[lennart-finke]

This PR refactors make-me-say to be compatible with the Solvers API.

Instead of passing three completion functions, the eval is now passed one solver as the con artist and two completion functions as the mark and summary model respectively. We still assume gpt-4-32k and gpt-3.5-turbo-16k as defaults, as #1530 is not yet merged. (Edit: Reviewer suggested adding gpt-4o-mini as default instead and changing the registry ourselves.)

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[lennart-finke]

Thanks for the comments @danesherbs! Addressed them and reran tests, ready for further review or merge.