Add Variance Inflation Factor ARD

[ddsjoberg]

Feature description

https://www.danieldsjoberg.com/gtsummary/reference/add_vif.html

If we need to add an additional package dependency, add it to Suggests, use the cards function to check whether it's installed, and be sure to add a minimum version that is at least the version required in gtsummary.

[zdz2101]

Hey @ddsjoberg saw this was on the board for to-do, is the logic for this supposed to be like below?

`regression object` |> ard_regression() |> ard_vif() 

[ddsjoberg]

thanks @zdz2101 ! I think we can make this one 'regression model' |> ard_vif(). Does that sound like it will work?

[zdz2101]

thanks @zdz2101 ! I think we can make this one 'regression model' |> ard_vif(). Does that sound like it will work?

makes sense too, so kinda like an enhanced ard_regression()