[Feat] Add Ribbon controller

[orangebobolink]

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Description of new feature

Hello everyone. Firstly, It's really nice library. I'm trying to create office app for myself and It would be nice If the library could offer a ribbon controller like here https://github.com/amazerol/AvaloniaRibbon
I tried to create a ribbon using tabs and an expander from SukiUI, but I didn't get the expected result. Maybe should add something similar to the demo using the existing controllers

Package Version

6.0.0-rc