Add plugin API: HideMainWindow(), IsMainWindowVisible()

[rainyl]

As mentioned in #2132 , I have added the two APIs to help plugins hide MainWindow

[github-actions]

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[Garulf]

Looks good!

Funny because Wox has this in its API:

[Obsolete]
public void HideApp()
{
    _mainVM.MainWindowVisibility = Visibility.Hidden;
}

But I guess it got removed.