[Feature Proposal]: Support isolated islands of assemblies for AOT compilation

[jevansaks]

Background and motivation

Our scenario is that we have

API Proposal

namespace System.Collections.Generic;

public class MyFancyCollection<T> : IEnumerable<T>
{
    public void Fancy(T item);
}

API Usage

// Fancy the value
var c = new MyFancyCollection<int>();
c.Fancy(42);

// Getting the values out
foreach (var v in c)
    Console.WriteLine(v);

Alternative Designs

No response

Risks

No response