WIP: Add failing tests for extending Code-First types

[tobias-tengler]

While playing around with Type Extension I've noticed that the following two cases do not work:

Extending a Code-first type from the Annotation-based approach:

public class CodeFirstType : ObjectType
{
    protected override void Configure(IObjectTypeDescriptor descriptor)
    {
        descriptor.Name("Query");

        descriptor.Field("field1").Resolve("");
    }
}

[ExtendObjectType(typeof(CodeFirstType))]
public class ExtendCodeFirstType
{
    public string Field2 => "";
}

Extending a Code-first type using ExtendsType<T>():

public class CodeFirstType : ObjectType
{
    protected override void Configure(IObjectTypeDescriptor descriptor)
    {
        descriptor.Name("Query");

        descriptor.Field("field1").Resolve("");
    }
}

public class CodeFirstTypeExtension : ObjectTypeExtension
{
    protected override void Configure(IObjectTypeDescriptor descriptor)
    {
        descriptor.ExtendsType<CodeFirstType>();

        descriptor.Field("field2").Resolve("");
    }
}

I wasn't sure whether these are intentional limitations or whether they are bugs and how to best go about solving them. In the end I just added these tests to showcase the issue.

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