FEAT: Added support for Azure Open AI API

[muhammadyaseen]

This PR adds support for models hosted on Azure Open AI service which would be very useful as the Azure platform is very commonly used by companies and enterprises to deploy and consume AI models.

There is no external dependency needed to be installed as the openai library already provides AsyncAzureOpenAI class which can be used to interact with the API.

I added the functionality in OpenAIClient class with the help of backend param to decide whether to use OpenAI or Azure clients.

The .env.example file was also update as the Azure client requires some additional keys to be set.

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[ChenZiHong-Gavin]

Hi @muhammadyaseen , thanks for adding Azure OpenAI support - this will be very useful。
Before we can merge, please address the Pylint failures.

[muhammadyaseen]

@ChenZiHong-Gavin Thanks. Sure, will do.

[muhammadyaseen]

 uvx pylint --rcfile=.pylintrc baselines/ graphgen/ webui/

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Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

Should be good now I hope.

[ChenZiHong-Gavin]

Sure, LGTM.