refactor(parser): type YTNodes' data arg as RawNode (wip) (#339)

* replaced YTNode's data arg as RawNode

* updated documentation

* removed unused import

---- Note that there are still many nodes that need to be updated, hence the WIP status.

src/parser/classes/Alert.ts

@@ -1,13 +1,13 @@
 import Text from './misc/Text.js';
 import { YTNode } from '../helpers.js';
-
+import type { RawNode } from '../index.js';
 class Alert extends YTNode {
   static type = 'Alert';
 
   text: Text;
   alert_type: string;
 
-  constructor(data: any) {
+  constructor(data: RawNode) {
     super();
     this.text = new Text(data.text);
     this.alert_type = data.type;