fix(accumulateDelta): AssistantStream accumulateDelta toolCall (#771)

[A4F54B]

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Changes being requested

One solution I see for this problem is to call openai.beta.threads.runs.retrieve. This PR fixes this bug and allows multiple toolCalls to return, so that calls can be listened to in toolCallCreated and toolCallDone, thus avoiding polling retrieve and improving efficiency. In addition, with this modification, users no longer need to manually assemble the arguments string, they only need to use function.arguments in callTool in the toolCallDone callback.

stream.on("toolCallDone",async (toolCall) =>{
  console.log(toolCall.function.arguments)
})

Additional context & links

#771

https://community.openai.com/t/how-to-properly-handle-the-function-call-in-assistant-streaming-node-js/687193