Changes to Bulk list employments

added the new optional query request parameter group_tax_servicing_countries

added the optional property data/items/country/global_payroll_supported to the response with the 200 status

added the new invited enum value to the data/items/user_status response property for the response status 200

added the optional property data/items/contractor_settings/charges_vat to the response with the 200 status

removed the offboarding enum value from the data/items/status response property for the response status 200

added the optional property data/items/partner_external_id to the response with the 200 status

endpoint added