[5.4] Remove files hydration

[themsaid]

Since the Validator is now capable of dealing with arrays it might receive some complex structures like:

[
    'users' => [
        ['name' => 'Taylor', 'image' => $file],
        ['name' => 'Mohamed', 'image' => $file2],
    ]
];

In this example a user item may contain file values as well as regular data values, in such cases extracting files won't be possible.

Looking at the validator code, the only place where this hydration is useful is when we try to get the attribute type via getAttributeType() but using the attribute value we can get the type easily, this will leave the hydration thing useless IMO.

In this PR I remove this step from the Validator.

[taylorotwell]

Do you know if this has any breaking changes?

[themsaid]

afaik it's only the removal of the two methods getFiles and setFiles, other than this the Validator should work as normal, actually the hydration method was broken for a big while until that PR fixed it.