Move service worker support to the Static Web Assets SDK from the Blazor Webassembly SDK

[javiercn]

The service worker support we provide takes care of updating the service worker as well as generating a list of files (which is based on the list of static web assets).

Since most of the work here means computing a list of assets to consume: see for some of the design considerations as the approach for this should be similar.

Computing this list should probably happen before the assets get compressed.

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We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
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