[Feature]: Add Python Azure OpenAI support to traceai_openai

[VaishnavGunjari]

The current OpenAIInstrumentor only patches openai.OpenAI. The AzureOpenAI client is not instrumented, so Azure OpenAI calls are silently untraced.
This is a significant gap since Azure OpenAI is widely used in enterprise environments.

Proposed solution:
Extend OpenAIInstrumentor to wrap AzureOpenAI with Azure-specific span attributes (deployment_name, api_version, endpoint, gen_ai.system = "azure_openai").

I'd like to contribute this if it aligns with the roadmap. Happy to discuss before opening a PR.