jad命令，类文件太大

- [x] 我已经在 [issues](https://github.com/alibaba/arthas/issues) 里搜索，没有重复的issue。

### 环境信息

* Arthas 版本: v3.7.2
* 操作系统版本: linux 4.18.0-3.0.el7.x86_64
* 目标进程的JVM版本: java8

### 使用疑问
使用jad命令反编译一个类后，该类内容过多，最前面的内容被吞了，如何分页展示

Start by reproducing the jad command on Linux with Java 8 against a class whose decompiled output is too large. Read the jad command's output handling and determine how paging should work without losing the beginning of the output. Done means large jad results can be viewed page by page with the complete content preserved.

Written by the indexing model from the issue text.