[FEAT] Azure Pricing - based on base_model in model_info

[ishaan-jaff]

Azure Pricing - Use Base model for cost calculation

Why ?

Azure returns gpt-4 in the response when azure/gpt-4-1106-preview is used, We were using gpt-4 when calculating response_cost

How to use - set base_model on config.yaml

model_list:
  - model_name: azure-gpt-3.5
    litellm_params:
      model: azure/chatgpt-v-2
      api_base: os.environ/AZURE_API_BASE
      api_key: os.environ/AZURE_API_KEY
      api_version: "2023-07-01-preview"
    model_info:
      base_model: azure/gpt-4-1106-preview

View Cost calculated on Langfuse

This used the correct pricing for azure/gpt-4-1106-preview = (9*0.00001) + (28*0.00003)

[railway-app]

This PR is being deployed to Railway 🚅

litellm: ◻️ REMOVED

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 8, 2024 2:19am
litellm-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 8, 2024 2:19am

[ishaan-jaff]

cc @Manouchehri