Registers a Service Worker that intercepts HTTP requests and serves cached files from IndexedDB.
This function creates a Service Worker from the inline worker code, registers it with the browser,
and returns the registration. If a Service Worker is already active, it returns the existing registration.
Registers a Service Worker that intercepts HTTP requests and serves cached files from IndexedDB. This function creates a Service Worker from the inline worker code, registers it with the browser, and returns the registration. If a Service Worker is already active, it returns the existing registration.