Cannot create a custom AndroidClientHandler that derives from AndroidClientHandler

[emorell96]

Steps to Reproduce

0. Create a MAUI project in Visual Studio Preview
1. Create a class that derives from AndroidClientHandler in Xamarin.Android.Net
2. Instantiate this class and pass it to an HttpClient.
3. The construction of the derived class will fail when it calls base() since it cannot find the _nativeHandler field in AndroidClientHandler.

I don't see this happening in a Xamarin project, I guess because it builds with mono android 10?

public class DerivedHandler : AndroidClientHandler
    {
        public DerivedHandler() : base()
        {

        }
    }

Using the class above fails in MAUI. Interestingly enough doing:

public class DerivedHandler2 : DerivedHandler 
    {
        public DerivedHandler() : base()
        {

        }
    }

Gives you an error but this time it complains that DerivedHandler and not AndroidClientHandler doesn't have the _nativeHandler field. I am guessing it's this line of AndroidClientHandler.cs#L318, that creates the issue since it tries to find the _nativeHandler in the base clase which is different if I've inherited the class.

Expected Behavior

Be able to call the base constructor from the derived class without issues.

Actual Behavior

Base constructor fails in AndroidClientHandler Line 70 when it tries to call the GetUnderlyingHandler method.

Version Information

Microsoft Visual Studio Community 2022
Version 17.1.0 Preview 1.0
VisualStudio.17.Preview/17.1.0-pre.1.0+31903.286
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