[Feature Request] Show progress for downloads and installs

[discentem]

Right now there is no indication of progress while downloading or installing an update in the event log or stdout. There are only log entries when a download/install starts and finishes.

Per conversations with cjgenevi, I think https://docs.microsoft.com/en-us/windows/win32/api/wuapi/nf-wuapi-iupdateinstaller-begininstall is needed for this but I am unsure how to implement this method within go and go-ole.