This commit adds support for the updateViaCache option when configuring Angular Service Workers.

The change includes:

• Added updateViaCache to SwRegistrationOptions interface
• Modified service worker registration to pass the updateViaCache option
• Added comprehensive unit tests to verify the new functionality
• Updated existing tests to include the new option

Motivation/Use Cases

The updateViaCache option is particularly useful for:

• Fine-grained cache control: Determining when the browser consults the HTTP cache during service worker updates
• Performance optimization: Controlling caching behavior for service worker scripts and imported scripts
• Development workflows: Better control over service worker update mechanisms during development and production
• Compliance with PWA best practices: Aligning with modern service worker registration standards

Proposed Solution

• Add updateViaCache property to the SwRegistrationOptions abstract class
• Implement property handling in the service worker registration logic
• Pass the option through to the native navigator.serviceWorker.register() API
• Maintain full backward compatibility with existing configurations

Examples of New Usage

Basic configuration with provideServiceWorker

export const appConfig: ApplicationConfig = {
  providers: [
    provideServiceWorker('ngsw-worker.js', {
      enabled: !isDevMode(),
      updateViaCache: 'imports',
      registrationStrategy: 'registerWhenStable:30000',
    }),
  ],
};