The `System` Namespace Should Not Be Auto Imported

[Acmion]

Is your feature request related to a problem? Please describe. The namespace System is magically imported by .NET Interactive. Essentially, the line using System; is included somewhere even if the user has not specified this. This is not the case in standard C#.

One of the main issues is that the intellisense suggestions get polluted with unnecessary stuff.

Describe the solution you'd like An option to disable this behavior would be nice.

Describe alternatives you've considered Stop using .NET Interactive.