Add zero-inflated Beta-binomial distribution #1310
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Hey hope this zero-inflated Beta-binomial distribution implementation looks okay for #1243.
Mostly followed https://cran.r-project.org/web/packages/brms/vignettes/brms_customfamilies.html and the other families/code already in brms.
Here's a rough example using it with the data from Example 13.1 of McElreath's Statistical Rethinking: https://hdrab127.github.io/brms-zibb-example/brms_zeroinflated_betabinomial.html#model-4-zero-inflated-beta-binomial.
Happy to make any changes or add further tests/docs if it helps. Keen to learn more brms and contribute where possible as might be using a bit this year.
Thanks,
Hayden