Move node-feedparser to feedparser. Resolves #17467. (#20660)

* Move node-feedparser to feedparser. Resolves #17467.

* Fix test name

* Fix import in test for feedparser.

types/feedparser/feedparser-tests.ts

@@ -0,0 +1,32 @@
+import request = require('request');
+import * as FeedParser from "feedparser";
+
+const req = request('https://news.google.com/news?cf=all&hl=en&pz=1&ned=us&output=rss');
+const feedparser = new FeedParser({});
+
+req.on("error", error => {
+  // handle any request errors
+});
+
+req.on("response", res => {
+  if (res.statusCode !== 200) {
+    req.emit('error', new Error('Bad status code'));
+  } else {
+    req.pipe(feedparser);
+  }
+});
+
+feedparser.on('error', (error: Error) => {
+  // always handle errors
+});
+
+feedparser.on('readable', () => {
+  // This is where the action is!
+  const stream = feedparser;
+  const meta = feedparser.meta; // **NOTE** the "meta" is always available in the context of the feedparser instance
+  let item: FeedParser.Item;
+
+  while (item = stream.read()) {
+    console.log(item);
+  }
+});