Changes to Get segment

the response property priceTables became nullable for the status 200

the response property utm_campaign became nullable for the status 200

the response property utm_source became nullable for the status 200

the response property utmi_campaign became nullable for the status 200

the response property campaigns became nullable for the status 200

added the media type application/json for the response with the status 200

the endpoint scheme security vtex_session AND vtex_segment was added to the API

endpoint added

api path removed without deprecation