double-checking `check_zeroinflation` about performance HOT 4 OPEN

Two questions:

• is check_zeroinflation() useful / meaningful for nbinom1 or genpois? If yes, we should find a package that computes such distributions (maybe extraDistr?)
• should the function error for models that include a ZI component?

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bump

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@bwiernik any suggestions which model families to include/exclude when we speak of "count" models? When should insight::model_info()$is_count return TRUE or FALSE?

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I'm not too familiar with what check_zeroinflation() does under the hood to comment on the broader issues raised here ATM.

For count models, Poisson, negative binomial, geometric, and binomial (not bernoulli) and their variations would all be "count" models. Multinomial as well, though that has a somewhat different structure. Really most discrete families are count models.

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