cookiebanner: detect service workers and Cache Storage buckets

A registered service worker is a URL-shaped artifact (origin+path of
the worker script), so it goes in tracker_resources as a new
SERVICE_WORKER resource type. A Cache Storage bucket is an opaque
named string with no URL, so it goes in detected_trackers as a new
CACHE_STORAGE tracker type.

Frontend:
  - StorageDetector wraps caches.open() and enumerates caches.keys()
    on start to surface pre-existing buckets that pre-date the SDK
    load (service workers commonly populate caches eagerly on
    install).
  - ThirdPartyDetector wraps navigator.serviceWorker.register() and
    enumerates getRegistrations() on start.

Both wrappers degrade silently on insecure contexts where these APIs
are unavailable.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/server/api/cookiebanner/v1/handler.go

@@ -423,6 +423,8 @@ func (h *Handler) handleReportDetectedTrackers(w http.ResponseWriter, r *http.Re
 			storageType = coredata.TrackerTypeSessionStorage
 		case "indexed_db":
 			storageType = coredata.TrackerTypeIndexedDB
+		case "cache_storage":
+			storageType = coredata.TrackerTypeCacheStorage
 		default:
 			continue
 		}
@@ -457,6 +459,8 @@ func (h *Handler) handleReportDetectedTrackers(w http.ResponseWriter, r *http.Re
 			resourceType = coredata.TrackerResourceTypeFetch
 		case "media":
 			resourceType = coredata.TrackerResourceTypeMedia
+		case "service_worker":
+			resourceType = coredata.TrackerResourceTypeServiceWorker
 		default:
 			continue
 		}