added ask_stream endpoint

[carlodek]

you can now call azure openAI and OpenAI with streaming

Motivation and Context (Why the change? What's the scenario?)

I love repo but I'd love to call aureOpenAI and openAI in streaming way

High level description (Approach, Design)

I've added a new endpoint called /ask_stream, there is the possibility to customize the eosToken for chunks. Service will give back data:{MemoryAnswer object}.

[carlodek]

@microsoft-github-policy-service agree

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[dluc]

Update: for this feature to be merged, there's a couple of things to do:

• Check this similar PR Implement new streaming ask endpoint (WIP) #400 and decide which approach to take
• Support content moderation. The stream of tokens needs to be validated while streamed, on a configurable frequence. If at any point the text moderation fails, the stream needs to be reset, e.g. sending a special token or similar.