Fix for #175 (Inheritance for static methods)

[OmidRezaT]

Fix for #175
When registering a class, static methods of the target base class not get registered even though, other kind of base class members such as fields, properties, or even non-static methods did get registered.

public void RegisterExampleType()
{
    //Registering Type
    UserData.RegisterType<ExampleClass>();
}

public class ExampleClass : ExampleClassBase
{
    //✅ Get Registered and accessible
    public static int GetStaticValueChild() => 0;
    
    //✅ Get Registered and accessible
    public int ChildMethod() => 0;
}


public class ExampleClassBase
{
    //✅ Get Registered and accessible
    public int BaseMember;
    
    //✅ Get Registered and accessible
    public int NonStaticMethod() => 0; 
    
    //❌ Not get registered 
    public static int StaticBaseMethod() => 0;
}

The was because of the BindingFlags which FrameworkClrBase use to find methods lacks BindingFlags.FlattenHierarchy flag which is required for retrieving the static methods from the target base class.

this is a documented behavior of Type.GetMethods(BindingFlags) method:

Specify BindingFlags.FlattenHierarchy to include public and protected static members up the hierarchy; private static members in inherited classes are not included.