Add system ID to parking structure

schema.graphqls

@@ -30,6 +30,7 @@ type ParkingStructure {
   coordinates: Coordinates!
   address: String!
   updatedTime: DateTime
+  systemId: ID!
 
   historicalAverages(input: HistoricalParkingAverageQueryInput): [HistoricalParkingAverageQueryResult!]
 }