Show Dialog crash in NativeAOT

[kant2002]

Describe the bug
After compiling KirillOsenkov/MSBuildStructuredLog#564
When pressing Open File Dialog crash with

Unhandled Exception: EETypeRva:0x07F1B9A0(System.Runtime.InteropServices.MissingInteropDataException): Avalonia.X11.NativeDialogs.Gtk+signal_generic is missing delegate marshalling data. To enable delegate marshalling data, add a MarshalDelegate directive to the application rd.xml file. For more information, please visit http://go.microsoft.com/fwlink/?LinkID=393965
   at Internal.Runtime.CompilerHelpers.RuntimeInteropData.GetDelegateMarshallingStub(RuntimeTypeHandle, Boolean) + 0x91
   at System.Runtime.InteropServices.PInvokeMarshal.AllocateThunk(Delegate) + 0x7f
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValueLocked(TKey, ConditionalWeakTable`2.CreateValueCallback) + 0x27
   at System.Runtime.CompilerServices.ConditionalWeakTable`2.GetValue(TKey, ConditionalWeakTable`2.CreateValueCallback) + 0x41
   at System.Runtime.InteropServices.PInvokeMarshal.GetFunctionPointerForDelegate(Delegate) + 0x97
   at Avalonia.X11.NativeDialogs.Glib.ConnectSignal[T](IntPtr, String, T) + 0x5e
   at Avalonia.X11.NativeDialogs.GtkSystemDialog.ShowDialog(String, IWindowImpl, GtkFileChooserAction, Boolean, String, IEnumerable`1, String) + 0x345
   at Avalonia.X11.NativeDialogs.GtkSystemDialog.<>c__DisplayClass3_0.<ShowFileDialogAsync>b__0() + 0x133
   at Avalonia.X11.NativeDialogs.Glib.<>c__DisplayClass15_0`1.<RunOnGlibThread>b__0() + 0x1b

To Reproduce

1. Clone branch from PR Add publishing configuraiton for NativeAOT KirillOsenkov/MSBuildStructuredLog#564
2. Run ./PublishNativeAOT.sh
3. Run bin/StructuredLogViewer.Avalonia/Release/net6.0/linux-x64/publish/StructuredLogViewer.Avalonia
4. Open File->OpenLog

Expected behavior
I think it should not crash.

Additional context
I did not sure that this is actionable in this repo, except I want this case to be documented, and either I or somebody from community come up with custom rd.xml, or offending code can be rewritten not to crash.

[kekekeks]

I guess we might need to add [UnmanagedFunctionPointer] attributes to GTK callback delegates here:

Avalonia/src/Avalonia.X11/NativeDialogs/Gtk.cs

Line 172 in 7842883

public delegate bool signal_generic(IntPtr gtkWidget, IntPtr userData);