Add Ability to Create SDT for EventSources

There currently is only functionality to create a SDT by DataSource. Windows Event Log entries are considered Event Sources and are unable to be selected in the DataSource selection drop down. In order to make non critical changes during the day that we know are going to trigger Windows Event errors we either have to put EVERYTHING into an SDT, which is bad because then we miss legitimate failure notifications, or we have to go to every single device and disable collection/alerting for Windows Events which would be way too time consuming today and will only get worse as the environment grows. 

I'd like to have EventSources included in the DataSource drop down so we can avoid a flood of notifications for expected errors.