🔑 fix: Azure Serverless Support for API Key Header & Version

[danny-avila]

Summary

I implemented support for Azure serverless mode by adding proper handling of API key headers and version query parameters across all clients and endpoints.

• Added support for api-key header in serverless mode for Azure OpenAI API requests
• Implemented azureOpenAIApiVersion query parameter support for serverless endpoints
• Updated Azure validation and extraction types with proper optional chaining and defaults
• Added tests to verify serverless configurations expect azureOpenAIApiVersion
• Fixed typing issues in Azure config validation for model groups and maps
• Added proper null checks and default values for Azure configuration properties

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

I tested the changes by:

1. Verifying API requests include proper headers and query parameters in serverless mode
2. Running the updated test suite for Azure configurations
3. Testing with a live Azure serverless endpoint to confirm authentication works
4. Validating different Azure config scenarios handle optional properties correctly

Test Configuration:

endpoints:
  azureOpenAI:
    groups:
    - group: "llama318b-inference"
      apiKey: "${LLAMA318B_SERVERLESS_API_KEY}" 
      baseURL: "https://example.services.ai.azure.com/models/"
      serverless: true
      models:
        Meta-Llama-3.1-8B-Instruct: true

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective
• Local unit tests pass with my changes