src: add news and store channels, and missing guild props (#3168)

* src: Implement store and news channels!

* src: Remove code dupe

* src: Add missing guild properties

* docs: Add a small notice that the channel type may also change

* src: Remove re-creation of the MessageStore

* lint: Unused Import

* src: Requested changes for StoreChannels

* typings: Fix typings

* src: Moar guild updates

* src: Set maximumPresence to the data prop, the already existent one, or default to 5000

* typings: afkChannel is a VC

I keep confusing them, ffs

Co-Authored-By: vladfrangu <kingdgrizzle@gmail.com>

* docs: Document that maximumMembers and maximumPresences may be inaccurate before fetching

* src Appels requested changes

src/structures/NewsChannel.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const TextChannel = require('./TextChannel');
+
+/**
+ * Represents a guild news channel on Discord.
+ * @extends {TextChannel}
+ */
+class NewsChannel extends TextChannel {
+  _patch(data) {
+    super._patch(data);
+
+    // News channels don't have a rate limit per user, remove it
+    this.rateLimitPerUser = undefined;
+  }
+}
+
+module.exports = NewsChannel;