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[llms-openai-proxy]Solve issue#1423: add open.proxy params loading from environment
This PR is to solve the issue#1423. Add http_proxy loading from environment in openai.py for both BaseOpenAI and OpenAIChat. It is an optional env variables not mandatory.
This is my first PR, so I am not sure of the code formatting and lint. Please correct or assign issue to me to make it if any.