修改插件：Doc2X插件适配文件上传功能 (#2284)

* Change to download first and check contentType

* Up to date

* Some bug fix, still some bug with img

* Update tool to read from file

* improve formatting in PDF

* Add tool of img file OCR , but meet some bug

* Bug fix for parameter passing error.

* Modification Introduction

packages/plugins/src/Doc2X/template.json

@@ -3,7 +3,7 @@
   "version": "488",
   "name": "Doc2X服务",
   "avatar": "plugins/doc2x",
-  "intro": "传入的URL形式的图片或PDF文件发送至Doc2X进行解析，返回带LaTeX公式的markdown格式的文本。",
+  "intro": "将传入的图片或PDF文件发送至Doc2X进行解析，返回带LaTeX公式的markdown格式的文本。",
   "showStatus": true,
   "weight": 10,