This introduces comprehensive Azure OpenAI support to the NeMo Agent Toolkit, enabling users to leverage Azure OpenAI services for both language models and embeddings across all supported AI frameworks.

- **New Azure OpenAI LLM Provider** (`azure_openai_llm.py`)
  - Full configuration support with API key, endpoint, deployment, and model parameters
  - Temperature, top-p, seed, and retry configuration
  - Unified naming conventions with alias support for compatibility

- **New Azure OpenAI Embedder Provider** (`azure_openai_embedder.py`)
  - Dedicated embedder implementation for Azure OpenAI embedding models
  - API key and endpoint configuration
  - Deployment-based model selection

Updated all major AI framework plugins to support Azure OpenAI:
- **LangChain** - LLM and embedder integration
- **LlamaIndex** - LLM and embedder integration with dependency updates
- **CrewAI** - LLM integration
- **Semantic Kernel** - LLM integration

- **Comprehensive LLM documentation** with Azure OpenAI configuration examples
- **Embedder documentation** with setup instructions and environment variables
- **Configuration examples** showing proper Azure deployment setup
- **Environment variable guidance** (`AZURE_OPENAI_API_KEY`, `AZURE_OPENAI_ENDPOINT`)

- **Enhanced workflow commands** with versioned dependency support
- **Improved testing coverage** for LangChain and LlamaIndex agents
- **CI/CD updates** for proper Azure OpenAI testing
- **Compatibility test fixes** and logic improvements

```yaml
llms:
  azure_openai_llm:
    _type: azure_openai
    azure_deployment: gpt-4o-mini

embedders:
  azure_openai_embedder:
    _type: azure_openai
    azure_deployment: text-embedding-3-small
```

- `azure_deployment`: Azure OpenAI deployment name
- `azure_endpoint`: Base URL for Azure OpenAI endpoint
- `api_version`: Azure OpenAI API version (default: `2025-04-01-preview`)
- `api_key`: Authentication key for Azure OpenAI services

- **Dependency updates** in `uv.lock` with Azure OpenAI SDK integration
- **Workflow template updates** for new Azure OpenAI workflows
- **CI/CD pipeline enhancements** for Azure OpenAI testing
- **Registry updates** to include new Azure OpenAI providers

- **Unified naming conventions** across embedder and LLM providers
- **Fixed compatibility test logic errors**
- **Improved function naming consistency** (e.g., `azure_openai_embedder_model`)

- New test coverage for Azure OpenAI LLM and embedder providers
- Integration tests for LangChain and LlamaIndex with Azure OpenAI
- Compatibility testing improvements
- CI/CD pipeline validation

- Existing workflows remain unchanged
- New Azure OpenAI providers are additive and don't affect existing configurations
- Environment variables follow Azure OpenAI naming conventions
- Full backward compatibility maintained

This PR significantly expands the NeMo Agent Toolkit's cloud provider ecosystem, offering users enterprise-grade Azure OpenAI integration with comprehensive framework support and documentation.

Closes NVIDIA#533

- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/NeMo-Agent-Toolkit/blob/develop/docs/source/resources/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Will Killian (https://github.com/willkill07)
  - Andrey Voroshilov (https://github.com/avoroshilov)

Approvers:
  - Yuchen Zhang (https://github.com/yczhang-nv)

URL: NVIDIA#643