Add configprovider to openai text generation and model config

[JaJamyG]

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

I want to be able to change models from openai text generation in runtime.

High level description (Approach, Design)

The ability to change gpt models in runtime, to ask question to open ai

[JaJamyG]

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[JaJamyG]

fixes #1042

[dluc]

Did you try overriding the model?

I tested the PR, and requests are always sent to the model defined in the configuration, not the one in the context.

I suspect that the client used internally (Semantic Kernel) doesn't support passing the model ID in the request.