use AccessTokenAuthorizable with MultiTarget

Moya MultiTarget with AccessTokenAuthorizable

extension MultiTarget: AccessTokenAuthorizable {
    public var authorizationType: AuthorizationType {
        // here you will have to check whether the `target` is also conforming to `AccessTokenAuthorizable` or not...
        if target is AccessTokenAuthorizable {
            guard let authTarget = target as? AccessTokenAuthorizable else {
                return .none
            }
            return authTarget.authorizationType
        }
        return .none
    }
}