[.Net][Feature Request]: Use Azure.AI.OpenAI v2.0 in AutoGen.OpenAI package

[LittleLittleCloud]

Is your feature request related to a problem? Please describe.

Use the new OpenAI SDK in AutoGen.OpenAI

In the meantime, the old AutoGen.OpenAI will be renamed to AutoGen.OpenAI.V1 for those who don't want to migrate to Azure.AI.OpenAI v2 package in their project.

Additional context

This will introduce api-break-change to previous version, because Azure.AI.OpenAI v2.0 is not compatible with v1.17.0

migration guide

For those who want to keep on the old AutoGen.OpenAI package which depends on Azure.AI.OpenAI v1 package, simply replace AutoGen.OpenAI with AutoGen.OpenAI.V1 package instead. You would need to update the namespace from using AutoGen.OpenAI to using AutoGen.OpenAI.V1.

For those who want to use the new AutoGen.OpenAI package which depends on OpenAI V2 package, you would need to pass a ChatClient instead of OpenAIClient to OpenAIChatAgent.

var openAIClient = new OpenAIClient(apiKey);

// previous way of creating OpenAIChatAgent
var openAIClientAgent = new OpenAIChatAgent(
            openAIClient: openAIClient,
            model: "gpt-4o-mini",
            name: "assistant",
            systemMessage: "You are a helpful assistant designed to output JSON.",
            seed: 0, // explicitly set a seed to enable deterministic output
            responseFormat: ChatResponseFormat.JsonObject) // set response format to JSON object to enable JSON mode
            .RegisterMessageConnector()
            .RegisterPrintMessage();

// new way of creating OpenAIChatAgent
var openAIClientAgent = new OpenAIChatAgent(
            openAIClient: openAIClient.GetChatClient("gpt-4o-mini"),
            name: "assistant",
            systemMessage: "You are a helpful assistant designed to output JSON.",
            seed: 0, // explicitly set a seed to enable deterministic output
            responseFormat: ChatResponseFormat.JsonObject) // set response format to JSON object to enable JSON mode
            .RegisterMessageConnector()
            .RegisterPrintMessage();

In the meantime, the following agent is deprecated

• GPTAgent: this agent is replaced by OpenAIChatClient.

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Tasks

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1. Rename existing AutoGen.OpenAI package to AutoGen.OpenAI.V1 [.Net] Rename AutoGen.OpenAI to AutoGen.OpenAI.V1 #3358
2. Use Azure.AI.OpenAI v2 in AutoGen.OpenAI package [.Net] Add AutoGen.OpenAI package that uses OpenAI v2 SDK #3402