Axios ES2017 (#4787)

* Added AxiosHeaders class;

* Fixed README.md href;

* Fixed a potential bug with headers normalization;

* Fixed a potential bug with headers normalization;
Refactored accessor building routine;
Refactored default transforms;
Removed `normalizeHeaderName` helper;

* Added `Content-Length` accessor;
Added missed `has` accessor to TS types;

* Added `AxiosTransformStream` class;
Added progress capturing ability for node.js environment;
Added `maxRate` option to limit the data rate in node.js environment;
Refactored event handled by `onUploadProgress` && `onDownloadProgress` listeners in browser environment;
Added progress & data rate tests for the http adapter;
Added response stream aborting test;
Added a manual progress capture test for the browser;
Updated TS types;
Added TS tests;
Refactored request abort logic for the http adapter;
Added ability to abort the response stream;

* Remove `stream/promises` & `timers/promises` modules usage in tests;

* Use `abortcontroller-polyfill`;

* Fixed AxiosTransformStream dead-lock in legacy node versions;
Fixed CancelError emitting in streams;

* Reworked AxiosTransformStream internal logic to optimize memory consumption;
Added throwing an error if the request stream was silently destroying (without error) Refers to #3966;

* Treat the destruction of the request stream as a cancellation of the request;
Fixed tests;

* Emit `progress` event in the next tick;

* Initial refactoring;

* Refactored Mocha tests to use ESM;

* Refactored Karma tests to use rollup preprocessor & ESM;
Replaced grunt with gulp;
Improved dev scripts;
Added Babel for rollup build;

* Added default commonjs package export for Node build;
Added automatic contributors list generator for package.json;

Co-authored-by: Jay <jasonsaayman@gmail.com>

test/typescript/axios.ts

@@ -7,7 +7,7 @@ import axios, {
   Cancel,
   CancelToken,
   CancelTokenSource,
-  Canceler
+  Canceler, AxiosProgressEvent
 } from 'axios';
 
 const config: AxiosRequestConfig = {
@@ -34,8 +34,8 @@ const config: AxiosRequestConfig = {
   responseType: 'json',
   xsrfCookieName: 'XSRF-TOKEN',
   xsrfHeaderName: 'X-XSRF-TOKEN',
-  onUploadProgress: (progressEvent: ProgressEvent) => {},
-  onDownloadProgress: (progressEvent: ProgressEvent) => {},
+  onUploadProgress: (progressEvent: AxiosProgressEvent) => {},
+  onDownloadProgress: (progressEvent: AxiosProgressEvent) => {},
   maxContentLength: 2000,
   maxBodyLength: 2000,
   validateStatus: (status: number) => status >= 200 && status < 300,
@@ -389,3 +389,37 @@ axios.toFormData({x: 1}, new FormData());
 // AbortSignal
 
 axios.get('/user', {signal: new AbortController().signal});
+
+// AxiosHeaders methods
+
+axios.get('/user', {
+    transformRequest: (data, headers) => {
+        headers.setContentType('text/plain');
+        headers['Foo'] = 'bar';
+    },
+
+    transformResponse: (data, headers) => {
+        headers.has('foo');
+    }
+});
+
+// Max Rate
+
+axios.get('/user', {
+  maxRate: 1000
+});
+
+axios.get('/user', {
+  maxRate: [1000, 1000],
+});
+
+// Node progress
+
+axios.get('/user', {
+  onUploadProgress: (e) => {
+    console.log(e.loaded);
+    console.log(e.total);
+    console.log(e.progress);
+    console.log(e.rate);
+  }
+});