Add support for Azure, OpenAI, Palm, Anthropic, Cohere Models - using litellm

[ishaan-jaff]

I'm the maintainer of litellm https://github.com/BerriAI/litellm - a simple & light package to call OpenAI, Azure, Cohere, Anthropic, Replicate API Endpoints

This PR adds support for models from all the above mentioned providers (by creating a class liteLLMChatGPTBot)

Here's a sample of how it's used:

from litellm import completion

## set ENV variables
# ENV variables can be set in .env file, too. Example in .env.example
os.environ["OPENAI_API_KEY"] = "openai key"
os.environ["COHERE_API_KEY"] = "cohere key"

messages = [{ "content": "Hello, how are you?","role": "user"}]

# openai call
response = completion(model="gpt-3.5-turbo", messages=messages)

# cohere call
response = completion("command-nightly", messages)

# anthropic call
response = completion(model="claude-instant-1", messages=messages)

[ishaan-jaff]

cc @iuiaoin can i get a review on this

[iuiaoin]

@ishaan-jaff Thanks for your pull request! I got a comment for you

[ishaan-jaff]

@iuiaoin thanks for the review, I updated the code + added some more info on the readme

[iuiaoin]

@ishaan-jaff LGMT，approved. Yet seems ci failed

[ishaan-jaff]

@iuiaoin fixed lint errors