`ctx.RootType` should be the type which `Resolve` calls

[scott-xu]

Describe the bug
I think the ctx.RootType should be the type which Resolve calls. However, it is lightweight root.

To Reproduce

namespace PureDIRootTypeTest
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using Pure.DI;
    using Shouldly;

    internal partial class Program
    {
        private static void Setup() => DI.Setup()
            .Bind().To(ctx => new Logger(ctx.RootType))
            .Root<Parent>();

        static void Main(string[] args)
        {
            var parent = new Program().Resolve<Parent>();
            parent.Child.Logger.Type.ShouldBeOfType<Parent>(); // It is LightweightRoot264d
        }
    }

    public class Parent
    {
        public Parent(Child child)
        {
            Child = child;
        }
        public Child Child { get; }
    }


    public class Child
    {
        public Child(Logger logger)
        {
            Logger = logger;
        }
        public Logger Logger { get; }
    }

    public class Logger
    {
        public Logger(Type type)
        {
            Type = type;
        }

        public Type Type { get; }
    }
}

Expected behavior
type of Parent