onnxruntime

ff0715d3 - Adding candidate metadata key for tracking EP's OS driver version (#26616)

Adding candidate metadata key for tracking EP's OS driver version (#26616) ### Description This change adds a well-known key name (`os_driver_version`) corresponding to the OS driver version associated with an EP. We will eventually flesh this out to enable retrieving it from the `OrtEpDevice` if it's been populated, but for starters we reserve the name. ### Motivation and Context We have a scenario in WebNN where the browser would like to get the driver version associated with a given EP (this is to enable policy against the driver, e.g. for maintaining a blocklist if a particular driver version has a scenario-blocking bug in it). Having a mechanism to retrieve the driver version via ORT would help with implementing this feature. --------- Co-authored-by: Aditya Rastogi <adityar@ntdev.microsoft.com>