Notebooks are very out of date and no longer work with latest nugets

The introduction notebooks under Artificial Intelligence and Machine Learning use versions of nuget from Beta e.g. `Azure.AI.OpenAI, 1.0.0-beta.6`.

The APIs have changed significantly in the latest stable versions so the notebooks are not really helpful. A lot of code has to be changed to work in the new style including having to work out how to change e.g. `new ChatMessage(ChatRole.System, systemPrompt)` into `ChatMessage.CreateSystemMessage(systemPrompt)` and working out what to replace the various errored properties with.

For something so relevant and that MS is pushing so hard, it would be nice if these could be updated so they can be more easily copy-and-pasted. These appear in the very introduction of the ML.Net tutorials so they need to be right really.

Thanks