allowUnauthenticated() for all actions

[dereuromark]

Refs #361

It would be nice to have a less hacky way of

$this->Authentication->allowUnauthenticated([$this->request->getParam('action')]);

I can understand that not using any argument does not feel "safe" by default.
As such, maybe the proposed '*' string could be very clear on this.
Or we provide an own speaking method for it?

$this->Authentication->allowUnauthenticatedAll()

All()/Any() etc

[LordSimal]

This can be achieved by just setting the requireIdentity to false
https://book.cakephp.org/authentication/2/en/authentication-component.html#configure-automatic-identity-checks

[dereuromark]

An option for specific controllers? As this is only to be applied for very specific controllers that know all their actions are to be public.

[github-actions]

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