one versus all

[topepo]

make a function to get all the two-class statistics when there are 3+ levels (one_v_all)

[DavisVaughan]

I'm not sure we need this since you can just use macro/micro averaging for this case now. Some probability metrics do use yardstick:::one_vs_all_impl which essentially does this, but I don't know if it would be useful to expose this or not. It would have to be cleaned up and made more general for use with other class metrics. I'll leave that up to you

[DavisVaughan]

I think I'm going to close in favor of revisiting later if we have a true use case for it

[github-actions]

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