Static web assets SDK support for multi targeting conventions

[javiercn]

Update Static Web Assets to account for multitargeted projects.
The project needs to include the assets produced by the net8.0-browser TFM.
We need to handle the different TFM combinations here
We need to do work to support multi-targeting during build and publish.

For the conventions see https://learn.microsoft.com/en-us/dotnet/maui/platform-integration/configure-multi-targeting?view=net-maui-7.0

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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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[javiercn]

Initial cut here

Missing gaps:

• Conflict resolution for scoped css: We need to figure out what we do here. We don't want to embed the app bundle Project.styles.css. We want to keep platform specific styles (for example, if a component is defined inside the Browser folder) so we want to get the project bundle for it and merge it into the main app bundle in the embedding TFM.
• Conflict resolution for JS modules: There's likely no conflict as long as we don't do any rename.
• Conflict resolution for JS initializers: We need to pass in the initializers to the embedding TFM.
• Service worker
• Retrieve assets from embedded referenced projects: This is the case when the project is multitargeting and it has a project reference that is exclusive to the embedded target. For example, a project A that multitargets net8.0;net8.0-browser and there is a project reference to project B that only applies to net8.0-browser.
• Retrieve package assets from embedded referenced packages: This is the case when the project is multitargeting and it has a package reference that is exclusive to the embedded target. For example, a project A that multitargets net8.0;net8.0-browser and there is a package reference to package B that only applies to net8.0-browser.