Add native menu and tray icon bindings

[CoolCoderSuper]

@JaggerJo
I was taking another look at this and dug a bit deeper into how the render process works and got something working.

    override this.Initialize() =
        let menu = NativeMenu.create [
                    NativeMenu.items [
                        NativeMenuItem.create [
                            NativeMenuItem.header "File"
                            NativeMenuItem.isChecked true
                            NativeMenuItem.isEnabled false
                        ]
                    ]
                ]
        let tray =
            TrayIcon.create [
                TrayIcon.toolTipText "Control Catalog"
                TrayIcon.menu menu
            ]
        let icon = Avalonia.FuncUI.VirtualDom.VirtualDom.createObject tray :?> TrayIcon
        let icons  = TrayIcons()
        icons.Add(icon)
        TrayIcon.SetIcons(this, icons)

I still need to make sure I'm not missing any properties in the bindings.

I implemented an additional function in the VirtualDom module to render an AvaloniaObject instead of a Control.

This approach obviously isn't stateful since it only renders once.
I kinda feel like we should maybe come up with some better apis for managing the App object.
But open to your thoughts.

Fixes #427

[JaggerJo]

can we make this generic?

IView<'view> -> 'view

[JaggerJo]

@CoolCoderSuper nice progress!

The Virtual DOM was changed in many places to work with AvaloniaObject instead of Control. We are now able to diff and patch AvaloniaObjects. That change was required to support text runs IIRC.

I agree, we should do something similar to what Swift UI does. Maybe using a component like concept - App.create instead of Component.create

@main
struct FSApp: App {
  var body: some Scene {
    WindowGroup {
      ContentView()
    }
  }
}

[JaggerJo]

@CoolCoderSuper created a new branch to experiment with the additional changes. Realized that we can merge this to master directly... created a new PR: #477

Thanks for the good work!