Add threads support

[kaashmonee]

go-chatgpt/chat.go

Lines 134 to 139 in 8aeb601

	endpoint := "/chat/completions"
	httpReq, err := http.NewRequest("POST", c.config.BaseURL+endpoint, bytes.NewBuffer(reqBytes))
	if err != nil {
	return nil, err
	}
	httpReq = httpReq.WithContext(ctx)

It would be really cool to add Threads support -- I can work on this if you want!

https://platform.openai.com/docs/api-reference/threads

Thanks for this project btw, I was able to use it and found it super useful!

[ayush6624]

I'm glad you found it useful!

Please go ahead and create a PR!