Support for AzureOpenAI format

[hustshawn]

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Right now the API format is as OpenAI format. But there are cases customer from Azure may be using AzureOpenAI client, instead of OpenAI client. Shall we support AzureOpenAI as well? let's say it can be enabled via an configuration at the deployment stage.

Once the feature is supported, it will help customer easily migrate from Azure to Amazon Bedrock.

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Reference: https://learn.microsoft.com/en-us/azure/ai-services/openai/how-to/switching-endpoints

# OpenAI example
curl $OPENAI_BASE_URL/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "anthropic.claude-3-sonnet-20240229-v1:0",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'

# Azure OpenAI
curl $AZURE_OPENAI_ENDPOINT/openai/deployments/gpt-35-turbo/chat/completions?api-version=2024-02-01 \
  -H "Content-Type: application/json" \
  -H "api-key: $AZURE_OPENAI_API_KEY" \
  -d '{"messages":[{"role": "system", "content": "You are a helpful assistant."},{"role": "user", "content": "Does Azure OpenAI support customer managed keys?"},{"role": "assistant", "content": "Yes, customer managed keys are supported by Azure OpenAI."},{"role": "user", "content": "Do other Azure AI services support this too?"}]}'