Suggestion: `seeElementHasClass()`

I wrote a simple method for `App\Tests\Support\Helper\Acceptance` to check if an HTML element has a certain CSS class. Does the same as JavaScript `.classList.contains()`:

```php
public function seeElementHasClass(array|string $element, string $class): void
{
$I = $this->getModule('WebDriver');
$classesString = $I->grabAttributeFrom($element, 'class');
$classesArray = explode(' ', $classesString);
$this->assertContains($class, $classesArray);
}

public function dontSeeElementHasClass(array|string $element, string $class): void
{
$I = $this->getModule('WebDriver');
$classesString = $I->grabAttributeFrom($element, 'class');
$classesArray = explode(' ', $classesString);
$this->assertNotContains($class, $classesArray);
}
```

Maybe somebody could add it to the module? :-)