[BUG] - InputValueExtractor fais on objects with indexes

[Unholius]

`
private class PocoClassWithIndex
{
public string Name { get; set; }
public object this[string name] => Name;
public int Age { get; set; }
public IEnumerable Fruits; // Field
};

[Fact]
public void ToValueDictionary_Given_InputIsPocoClass_Then_Output_IsAnEquivalentDictionary()
{
    var valueObject = new PocoClassWithIndex
    {
        Name = "John",
        Age = 18,
        Fruits = new List<string> { "Apples, Oranges" }
    };

    var expectedOutput = new Dictionary<string, object>
    {
        ["Name"] = "John",
        ["Age"] = 18,
        ["Fruits"] = new List<string> { "Apples, Oranges" }
    };

    var sut = new InputValueExtractor();
    var result = sut.ToValueDictionary(valueObject);
 
    Assert.Equal(result.Count, expectedOutput.Count);
    foreach (var (key, value) in result)
    {
        Assert.Equal(value, expectedOutput[key]);
    }
}

`