Small important improvement

[williamneves]

When we create a chat, we should have the option to add headers, like:

import { Configuration, OpenAIApi } from "openai";

const configuration = new Configuration({
    apiKey: process.env.OPENAI_API_KEY,
    basePath: "https://oai.hconeai.com/v1",
    baseOptions: {
    headers: {
        "Helicone-Auth": `Bearer ${process.env.HELICONE_API_KEY}`,
    },
});

const openai = new OpenAIApi(configuration);

Thanks!

[lucgagan]

Would accept a PR for this