A new built-in change function - `touch_related` about ash HOT 2 OPEN

This makes sense to me. We can use bulk actions in the change as well to ensure we don't get an N+1 issue (instead just N = relationship depth). I think it can work for any arbitrary relationships. The thing that is most concerning to me is that to do this in a way that isn't hacky, is that we need to have an action to cal. I think probably the best way to do this would be to require that a touch action exists on the target resource, who's job is to accept no attributes and only touch whatever fields should happen upon being touched.

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And at that point the action can be called whatever they want, but can default to touch. change touch(:relationship, action: :action), on: [:update, :destroy]

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