Add touch_all method to ActiveRecord::Relation

[fatkodima]

This PR is an update for #8343.

Differences/changes:

• accepts multiple column names
• accepts optional time argument
• addresses optimistic locking
• not hardcoding :updated_at/on as an always updated column

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[kddnewton]

Came here to add this PR, found this one already open. Nice work!

[rafaelfranca]

I think we should just make those methods public, but part of the private API.

[fatkodima]

@rafaelfranca updated with your suggestion.

[igorkasyanchuk]

the behaviour of this change is different from regular touch method, because with touch you can have a callback after_touch. And this change behaves identical to update_all.