Combine Blazor scoped css?

[dazinator]

dotnet/aspnetcore#10170 (comment)

Experiment to see if I can combine the scoped CSS output to the /obj folder by blazor msbuild, as per comment above, into a single CSS file, with a source map produced.

I should probably take a look at this: https://github.com/microsoft/sourcemap-toolkit#chaining-source-maps
as well as some maverick stuff I already did in the past here: https://github.com/dazinator/NetPack/tree/develop/src/NetPack.JsCombine