feat: implement HashArray utility and refactor product key generation for Redis

internal/ozon/products/repository_api.go

@@ -22,6 +22,10 @@ type apiRepository struct {
 	marketplaceRepository marketplace.Repository
 }
 
+func GetProductsKey(identifier string) string {
+	return fmt.Sprintf("ozon:products:%s", identifier)
+}
+
 func NewAPIRepository(marketplaceRepository marketplace.Repository) Repository {
 	return &apiRepository{
 		marketplaceRepository: marketplaceRepository,
@@ -136,7 +140,7 @@ func (a *apiRepository) StreamAllProductsCache(ctx context.Context, marketplaceI
 		errChan <- fmt.Errorf("getting marketplace identifier: %w", err)
 		return
 	}
-	key := fmt.Sprintf("ozon:products:%s", identifier)
+	key := GetProductsKey(identifier)
 	var cachedMessage pb.GetListOfProductsResponse
 	err = redis.ReadProtoMessage(ctx, key, &cachedMessage)
 	if err == nil && len(cachedMessage.Products) > 0 {