Add an "assumption" pipeline

[studsttat]

I found this package might be better than "infer" or "rstatix" package, and I currently wait for its CRAN submission. We see that when you write this:

sleep |> 
    define_model(extra ~ group) |> 
    prepare_test(TTEST) |> 
    conclude()

You are preparing t-test pipeline, right? How about adding another one after prepare_test(), like writing some assumptions? Because "infer" has assume, which defines the theoretical distribution.

[joshuamarie]

This is not the priority for now. Future updates, perhaps.