feat(yt): add getGuide() (#335)

* feat(yt): add `getGuide()`

* chore: lint

* fix(Guide): wrong prop

* fix(Guide): include subscription section

* fix(Guide): wrong import

* feat(Guide): add `page`

src/parser/classes/GuideCollapsibleEntry.ts

@@ -0,0 +1,35 @@
+import Text from './misc/Text.js';
+import { YTNode } from '../helpers.js';
+import Parser from '../parser.js';
+
+class GuideCollapsibleEntry extends YTNode {
+  static type = 'GuideCollapsibleEntry';
+
+  expander_item: {
+    title: string,
+    icon_type: string
+  };
+  collapser_item: {
+    title: string,
+    icon_type: string
+  };
+  expandable_items;
+
+  constructor(data: any) {
+    super();
+
+    this.expander_item = {
+      title: new Text(data.expanderItem.guideEntryRenderer.formattedTitle).toString(),
+      icon_type: data.expanderItem.guideEntryRenderer.icon.iconType
+    };
+
+    this.collapser_item = {
+      title: new Text(data.collapserItem.guideEntryRenderer.formattedTitle).toString(),
+      icon_type: data.collapserItem.guideEntryRenderer.icon.iconType
+    };
+
+    this.expandable_items = Parser.parseArray(data.expandableItems);
+  }
+}
+
+export default GuideCollapsibleEntry;