Expose `XDocument.Load(uri, LoadOptions.None)` to `XTypedServices.Load<T>(string)` method

[mamift]

There exists an XDocument.Load(textReader, LoadOptions) method, that allows getting line information for an XML file, but none of the XTypedServices.Load<T>() method overloads invoke it.

This issue exists to track adding/implementing a new XTypedServices.Load<T>() overload that exposes the XDocument.Load(textReader, LoadOptions) overload.

Because XTypedServices.Load<T>() is called in generated code, this needs changes to the code gen logic as well.