`Tracking` C#<->F# interop

[vzarytovskii]

Note
This is a "meta" issue for tracking purposes, since GitHub does not support special types of issues.

Tracking issue for .NET/C# interop:

• Scoped refs.
• C# & F# Records interop - suggestion
• CallerArgumentExpressionAttribute support - suggestion
• Raw strings (aka $$ strings) support - suggestion
• DefaultInterpolatedStringHandler support - suggestion
• Roles/Shapes/Extend everything - it's still WIP, need to sync with Mads
• Discriminated Unions Interop - need to sync with Fred