[Feature request] LUIS retired, CLU needed

[d-kleine]

Is your feature request related to a problem? Please describe.
It seems like there is currently no implementation of Conversational Language Understanding (CLU) in the Samples. As of 1st April, you cannot create new LUIS services anymore, see https://www.luis.ai/

Describe the solution you'd like
I would like to see a comprehensive node.js - and if possible also a Python - sample code that demonstrates how to implement CLU (to classify utterances into intents and extract information) with entities in the Azure bot. It would be beneficial if the sample code also includes comments or a guide that explains each part of the code and how it contributes to the overall functionality.

With reference to the Azure SDK, maybe ConversationAnalysisClient would be useful for that.

Describe alternatives you've considered
I have also thought about creating a custom solution, but this would require a significant amount of time and resources.

Additional context
Please also see #3942