Support simulating a Window close by user, which sets IsProgrammatic to false

[Measurity]

Is your feature request related to a problem? Please describe.

I want to provide custom controls with buttons that close a window. However, this is code outside of Avalonia, so the window closing event will have IsProgrammatic == true. Any logic relying on this flag will then be wrong.

Describe the solution you'd like

Add parameter to Window.Close method to specify IsProgrammatic value (default true?).

Describe alternatives you've considered

As a workaround I wrapped the Window.Close in extension methods and called those instead, wherever needed.

Additional context

Original feature request for IsProgrammatic: #9524