FR: Add $scope check to CompositeAuth

[Vovan-VE]

Filter CompositeAuth currently has no ability to check scope. It whoud be great to add such ability.

Future usage example:

public function behaviors()
{
    return [
        'authenticator' => [
            'class' => 'filsh\yii2\oauth2server\filters\auth\CompositeAuth',
            'scopeRequired' => 'foobar',
        ],
    ];
}