fix(Cargo): Expose CargoMessageSetItem

Ineeded in relaycorp/awala-gateway-internet#854

src/index.ts

@@ -67,9 +67,12 @@ export { Recipient } from './lib/messages/Recipient';
 export { default as Parcel } from './lib/messages/Parcel';
 export { default as ServiceMessage } from './lib/messages/payloads/ServiceMessage';
 export { default as Cargo } from './lib/messages/Cargo';
+export {
+  default as CargoMessageSet,
+  CargoMessageSetItem,
+} from './lib/messages/payloads/CargoMessageSet';
 export { CargoCollectionAuthorization } from './lib/messages/CargoCollectionAuthorization';
 export { CargoCollectionRequest } from './lib/messages/payloads/CargoCollectionRequest';
-export { default as CargoMessageSet } from './lib/messages/payloads/CargoMessageSet';
 export { default as InvalidMessageError } from './lib/messages/InvalidMessageError';
 export { default as RAMFValidationError } from './lib/ramf/RAMFValidationError';