Optimize file delivery, cache-busting, offline support (CSS, JS)

[hakenr]

Currently, we append a version modifier to the query string for our CSS and JS files where feasible. However, this approach is not ideal for several reasons. For instance, the automatically generated MyApp.styles.css files for CSS isolation do not include this version modifier. Additionally, there are problems related to offline mode in PWAs, as highlighted in issue #444, among other concerns.

In the Blazor roadmap, there's a promising feature under development titled 'Optimize file delivery', which could address these issues. More details can be found here: dotnet/aspnetcore#52824.

We should monitor this development closely and integrate the solutions into our library as soon as they become available.