[3.2.0] Export to CSV relationships

public static function getColumns(): array
    {
        return [
            ExportColumn::make('name')
                ->label('Naam'),
            ExportColumn::make('type')
                ->label('Type'),
            ExportColumn::make('email')
                ->label('E-mail'),
            ExportColumn::make('phone')
                ->label('Telefoon'),
            ExportColumn::make('vat_number')
                ->label('BTW nummer'),
            ExportColumn::make('address.address')
                ->label('Adres'),
            ExportColumn::make('address.zip_code')
                ->label('Postcode'),
            ExportColumn::make('address.place')
                ->label('Woonplaats'),
            ExportColumn::make('address.state_or_province')
                ->label('Provincie'),
            ExportColumn::make('address.country.name')
                ->label('Land'),
            ExportColumn::make('registration_number')
                ->label('Ondernemingsnummer'),
            ExportColumn::make('notes')
                ->label('Notities'),
        ];
    }