feat: add rule for Laravel Timestamps property to attribute

[yoannblot]

Context

Laravel 13 introduces the WithoutTimestamps attributes (source).

Description

This new rule replaces the old property $timestamps by the new #[WithoutTimestamps] attribute :

 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Attributes\WithoutTimestamps;

+#[WithoutTimestamps]
 final class User extends Model
 {
-    public $timestamps = false;
 }

or, removes the property when the value is true, because that's the default behavior :

 use Illuminate\Database\Eloquent\Model;

 final class User extends Model
 {
-    public $timestamps = true;
 }