FEAT Add AzureOpenAIGPTVChatTarget to Support MultiModal

[rdheekonda]

Description

• Added a new AzureOpenAIGPTVChatTarget class supports multimodal input (text and image) and generates textual output.

• Created a demo notebook to demonstrate how to run AzureOpenAIGPTVChatTarget.

• Implemented functionality to retrieve headers from the environment file and could pass them to the AzureOpenAI clients.

• Added a new class ChatMessageListContent for GPTV target and tests

• Added an end to end multimodal demo using AzureOpenAIGPTVChatTarget and PromptSendingOrchestrator in 3_send_all_prompts notebook

• Fixed two bugs: validate function in normalizer_request.py module and set same conversation ID across all prompt request pieces in PromptRequestResponse object

• Moving the chat message to its own module.

• Adjusted the validation method in PromptRequestResponse to handle chat conversation alternates, fixing existing test cases.

Tests and Documentation

• Added unit tests and jupytext modules.

[rlundeen2]

The only thing in my review I feel most strongly about is the testing comments, but everything is looking great. I'd love to see most of these changes but no blockers