Changes to List pending questions

the items/questions/items/header response property's maxLength was unset from 30 for the response status 200

the items/questions/items/options/items/label response property's maxLength was unset from 30 for the response status 200

the items/questions/items/header response property's maxLength was increased from 12 to 30 for the response status 200

added the optional property items/questions/items/custom to the response with the 200 status

added the optional property items/questions/items/multiple to the response with the 200 status

endpoint added