Implement Blazor endpoint data source updates

[javiercn]

• Similar to how MVC/Razor pages does.

• We need to implement updates that can be triggered by things like hotreload, so that we can pick up changes on the metadata in the types that has changed or new elements that might have been added, like new pages.

• See https://github.com/dotnet/aspnetcore/blob/bec278eabea54f63da15e10e654bdfa4168a2479/src/Mvc/Mvc/src/HotReloadService.cs for details

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