Don't assert on async delegate

[Evangelink]

Summary

Add a new analyzer similar to VSTHRD101 that would warn when an assertion is done is done in an async delegate call.

Background and Motivation

See example below, based off some customer code base:

internal delegate Call(string id);

[TestClass]
public class TestClass
{
    [TestMethod]
    public void M()
    {
        Call c = async s => Assert.IsNotNull(await GetData(s).ConfigureAwait(false));
        c("nok");
    }

    private Task<object?> GetData(string s)
    {
        if (s == "nok") return Task.FromResult<object?>(null);
        return Task.FromResult(new object());
    }
}

Proposed Feature

Add an analyzer

AB#2340735

[Youssef1313]

We should probably do it for async void in general, and not delegates specifically.