[8.x] Add UncompromisedVerifier facade and UncompromisedVerifierFake

[pgrenaud]

The NotPwnedVerifier makes HTTP request every time the uncompromised() feature of the Password rule is being used. This might be an undesirable behaviour in some environment, especially in local or testing environment. When the new Password rule was first introduced, some were wondering if there was an easy way to mock the uncompromised() feature.

This PR add the UncompromisedVerifier facade and the UncompromisedVerifierFake, a fake implementation of the UncompromisedVerifier contract. With a facade, we can easily reuse the fake mechanism to swap the instance for the fake one.

While this solution address the initial problem, I'm not sure that this is the right way to go. I'm curious to know if you would think of a better approach and I would gladly implement a different solution.

[taylorotwell]

Hey there - check out the example here: https://laravel.com/docs/8.x/validation#defining-default-password-rules

It shows how to disable this check in certain environments:

[pgrenaud]

Oh, I did not see that new feature coming through. It is a way better solution, more flexible and more useful! Thanks for letting me know!