添加插件：Doc2X 图片/文档识别 (#2097)

* Init the requrest part

* Finish the img deal part

* For test only one plugin

* Finish img2text part

* Finish pdf ocr part

* Change vscode setting back

* Change `for` into` for await` type

packages/plugins/register.ts

@@ -15,7 +15,10 @@ const packagePluginList = [
   'duckduckgo/search',
   'duckduckgo/searchImg',
   'duckduckgo/searchNews',
-  'duckduckgo/searchVideo'
+  'duckduckgo/searchVideo',
+  'Doc2X',
+  'Doc2X/URLPDF2text',
+  'Doc2X/URLImg2text'
 ];
 
 const list = [...staticPluginList, ...packagePluginList];