[9.x] Add setVisible and setHidden to Eloquent Collection

[jessarcher]

This PR adds setVisible and setHidden methods to Eloquent Collections.

We already have the makeVisible and makeHidden methods, but makeVisible is only useful when a property is usually hidden or when the model has a non-empty $visible property, and makeHidden is only useful when you want to be explicit about what is excluded, not what is included.

Example:

I want to return an array of users with just the ID and name, hiding other attributes such as email and any future attributes that may be added.

// This is effectively a no-op because these fields are not typically hidden.
$users->makeVisible(['id', 'name'])->toArray(); ❌
/*
[
    [
        'id' => 1,
        'name' => 'Test User',
        'email' => 'test@example.com'
    ]
]
*/

// This only gives us the desired result until a new non-hidden attribute is added to the model.
$users->makeHidden(['email'])->toArray(); 😐️
/*
[
    [
        'id' => 1,
        'name' => 'Test User',
    ]
]
*/

// This allows us to be explicit about the data we want, and it won't leak as new attributes are added to the model.
$users->setVisible(['id', 'name'])->toArray(); ✅
/*
[
    [
        'id' => 1,
        'name' => 'Test User',
    ]
]
*/

This is especially useful when passing collections to Inertia.