Include custom response headers

[WillianAgostini]

Fixes #6734

Example Usage

import axios, { AxiosResponse } from "axios";

type ResponseBody = {...}

type ResponseHeaders = {
  'x-header': string;
}

const response = await axios.get<ResponseBody, AxiosResponse<ResponseBody, any, ResponseHeaders>>("https://jsonplaceholder.typicode.com/todos/1");
console.log(response.headers['x-header']);

[jasonsaayman]

thanks @WillianAgostini i was going to add something similar as i have a similar requirement in a project, but you already did it 🤯 thanks

[github-actions]

Hi, @WillianAgostini! This PR has been published in v1.12.0 release. Thank you for your contribution ❤️!