SA1208 - Missing file-scoped namespace support

[ghost]

SA1208 SystemUsingDirectivesMustBePlacedBeforeOtherUsingDirectives is not fired when a file-scoped namespace is used.

Example:

namespace WebApi.Controllers;

using Microsoft.AspNetCore.Mvc;
using System;

[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
}

Environment:

• .NET 6
• C# 10
• StyleCop 1.2.0-beta.376