feature: Add support for Avalonia

[worldbeater]

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

There is no Avalonia support.

Describe the solution you'd like

Would be happy to see Sextant+Avalonia becoming great friends.

Describe alternatives you've considered

For now, we have a RoutedViewHost and stuff living in the Avalonia.ReactiveUI package https://github.com/AvaloniaUI/Avalonia/tree/master/src/Avalonia.ReactiveUI
So probably the classes from that package may shed some light on how to implement a NavigationView.

Describe suggestions on how to achieve the feature

Probably we could build and ship a new Sextant.Avalonia package supporting latest Avalonia NuGet release. Or, we could start the discussion on the Avalonia side, and contribute Sextant support directly into their repository. Not sure which option would be a better one...

[glennawatson]

Avalonia nav and wpf nav probably are fairly similar to each other. Eg each would require their own navigation stack.

[RLittlesII]

I think it's achievable. WPF is near the top of the list for platforms to support.

I would love to work with you to define how Sextant.Avalonia would work.

[github-actions]

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