Replace (and document) dependency on deprecated `yaourt`

Use Case

I'm trying to install arch AUR packages, from puppet's docs there's no indication installing AUR packages using the package resource. However digging into the code there seems to be support for installing AUR packages if yaourt is installed, however yaourt is deprecated and unmaintained since 2019.

Describe the Solution You Would Like

I would like to see the yaourt support replaced with another AUR helper, such as yay. Additionally, to help with discovery I'd like to see it documented that you can manage AUR packages with package if that dependency is present.

Describe Alternatives You've Considered

I've started an attempt at building an alternative aur_package resource for my own use that basically uses exec

Additional Context