Changes to Get an offer's end customer info

api operation id end_customer.getEndCustomerInfo removed and replaced with end_customer#getEndCustomerInfo

api operation id end_customer#getEndCustomerInfo removed and replaced with end_customer.getEndCustomerInfo

added the optional property end_customer/company_address to the response with the 200 status

added the optional property end_customer/not_vat_registered to the response with the 200 status

added the optional property end_user/phone_type to the response with the 200 status