Implicit using of Aspire.Hosting.Azure namespace

[IEvangelist]

Today, when you create a .NET Aspire app host project (and you've opted-into implicit usings), it automatically includes the Aspire.Hosting namespace.

I've always loved this feature, and I'd like to propose that we also do the same for the Aspire.Hosting.Azure NuGet package, so that it will automatically include a using for the Aspire.Hosting.Azure namespace.