Re-add api_inventory_service.go (#2)
Re-add api_inventory_service.go (#2)

Co-authored-by: Josue Rios <96f165878160286eb3d55ab2499ab141f4dbefba@google.com>
GoogleCloudPlatform/cloud-run-anthos-reference-web-app,GoogleCloudPlatform/cloud-run-anthos-reference-web-app,GoogleCloudPlatform/cloud-run-anthos-reference-web-app,GoogleCloudPlatform/cloud-run-anthos-reference-web-app,GoogleCloudPlatform/cloud-run-anthos-reference-web-app