[FEAT] As a user, I need to be informed when there's an update to the PWA so that I don't see stale content.

[xelaint]

:bulb: Feature request

Feature Name

As a user, I need to be informed when there's an update to the PWA so that I don't see stale content.

The Desired Behavior

1. Toast Component (#2499)
2. Caching functionality to service worker

Your Use Case

As a developer, I would like to let users know if there is an update to the PWA app.

Prior Work

Environment

Daffodil version: X.Y.Z
Angular version: X.Y.Z 

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[griest024]

Angular provides the SwUpdate service for this functionality. Its interface looks pretty good; it is likely sufficient to be directly called from the component.