feat: Add Azure support

[noahzibm]

Added a new class to openai.py called AzureOpenAIBackend. Azure requires using the AzureOpenAI client class and an extra param api_version to work properly. Also added some logic to intelligently drop reasoning_effort if its not set as this breaks the Azure client.

[mergify]

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[jakelorocco]

Thanks again for the PR @noahzibm; I've taken a look. I want to try a few things before merging this:

• testing if litellm will work
• seeing if there's a way to remove some of the code duplication / keep a consistent OpenAI backend

It also looks like some of the changes you made broke the OpenAIBackend by removing some of the functions. For future reference, you can install the pre-commit hooks using the command from this section to catch errors earlier.

If we end up going this route of creating the AzureOpenAIBackend, do you mind if I build off your commits and make a few changes?

[noahzibm]

@jakelorocco Sure, no problem. Litellm was our backend previously, I just wasn't sure how to use it with mellea.

[nrfulton]

I think this is resolved by @HendrikStrobelt's addition of litellm support.

@noahzibm are you satisifed with using litellm for Azure support, or should we continue work on this PR?

[noahzibm]

@nrfulton I'm good with closing this one, thank you!

[nrfulton]

Closing in favor of litellm.