Display vendor registration date on vendor-list table

add_filter( 'wcfm_vendors_additonal_data_hidden', '__return_false' );

add_filter( 'wcfm_vendors_additional_info_column_label', function( $label ) {
    return __( 'Registraton Date', 'wc-frontend-manager' );
} );

add_filter( 'wcfm_vendors_additonal_data', function( $data, $vendor_id ) {
    $data_value = get_user_meta( $vendor_id, 'wcfm_register_on', true );
    if ( $data_value ) {
        $registration_date = date( wc_date_format(), $data_value );
        if ($registration_date) {
            return $registration_date;
        }
    }
    return $data;
}, 10, 2 );