Define new method to get historical averages depending on timestamps and interval

src/repositories/ParkingGetterRepository.ts

@@ -1,6 +1,26 @@
 import { IParkingStructure } from "../entities/ParkingRepositoryEntities";
 
+export interface ParkingStructureCountOptions {
+  startUnixEpochMs: number;
+  endUnixEpochMs: number;
+  intervalMs: number;
+}
+
+export interface HistoricalParkingAverageQueryResult {
+  fromUnixEpochMs: number;
+  toUnixEpochMs: number;
+  averageSpotsTaken: number;
+}
+
+
 export interface ParkingGetterRepository {
   getParkingStructures(): Promise<IParkingStructure[]>;
   getParkingStructureById(id: string): Promise<IParkingStructure | null>;
+
+  /**
+   * Get historical averages of parking structure data using the filtering options.
+   * @param id
+   * @param options
+   */
+  getHistoricalAveragesOfParkingStructureCounts(id: string, options: ParkingStructureCountOptions): Promise<HistoricalParkingAverageQueryResult[]>;
 }