Azure Document Intelligence integration in LangChain

[stad121]

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Issue Content

I'm currently exploring the Azure Document Intelligence integration in LangChain and noticed that authentication relies on providing an API key. However, in many enterprise environments, relying solely on API keys is not ideal due to security and compliance concerns.

Would it be possible to support alternative authentication methods, such as:

Azure Active Directory (AAD) tokens via az account get-access-token
Managed Identity Authentication (for Azure-hosted environments like VMs, Functions, or AKS)
Azure CLI-based authentication (similar to how the Azure SDKs allow it)
These authentication mechanisms align better with security best practices, enabling more seamless and secure integrations with enterprise applications.

I’d love to hear your thoughts on whether such an enhancement is feasible or if there are any existing workarounds. Thank you for your time, and I appreciate your consideration of this request.