Remove unused kwargs passed to requests sent through AzureOpenAI

[Yummy2016]

This commit is to remove unused kwargs that we include in the requests sent through AzureOpenAI class.

This seems to fix this issue: #543

[insop]

@Yummy2016 thank you for the PR.
Let me check the change, first.

This code was updated recently due to this issue, #521.
I am using legacy openai.

[insop]

Thank you for the change. Let's merge this as many are hit the issue, @okhat.

(updated since previous note was not valid)

I tested with this PR and I still hit the issue #521.
For my setup, I use llm_metric and teach lm that are all azure model and saw this error when I am using BootstrapFewShotWithRandomSearch

<function llm_metric at 0xxx> due to __init__() missing 2 required positional arguments: 'api_base' and 'api_version'.

But let's get this change in first, and I will figure out how to address #521