[TIMOB-25344] Windows: New Timer implementation

According to the studies from TIMOB-25019, we found some pitfalls in current setTimeout/setInterval implementations. There may be rare chances to encounter but we want simpler/faster/safer implementation for it. - Make sure to clear callback right after callback is actually called from setTimeout. - Invoke callback immediately when interval equals zero. It had synchronization issue with clearTimeout/clearInterval. - Xaml::DispatcherTimer functions should have been called from UI thread. Use ThreadPoolTimer when possible, because it doesn't have the issue. - With ThreadPoolTimer, make sure to invoke callback from UI thread. Note that this is about internal implementation, so the API functionalities setTimeout/setInterval/clearTimeout/clearInterval should not be changed.