[Feature Request] Support for other nuget package sources

[DrLeh]

I love being able to see typeahead for <PackageReference>s but it's not showing ones from my company's internal nuget source, only nuget.org it seems. Is it possible for it query my nuget server to do this? Or maybe our nuget server is out of date and doesn't have the necessary feature to drive this?

[mhutch]

Is your internal feed authenticated? The extension attempts to read other package sources from Visual Studio, but it does not yet handle authenticated feeds.