希望增加监听RSS订阅到离线下载的功能

### Please make sure of the following things

- [X] I have read the [documentation](https://alist.nn.ci).
- [X] I'm sure there are no duplicate issues or discussions.
- [X] I'm sure this feature is not implemented.
- [X] I'm sure it's a reasonable and popular requirement.

### Description of the feature / 需求描述

115网盘的离线下载已经实现了，能不能再加个监听RSS订阅的功能

### Suggested solution / 实现思路

用户创建rss订阅选定更新时间和要离线下载的网盘或下载器，如115，PIKPAK，QB，aria2，根据用户建的rss定时获取rss资源自动推送离线下载

### Additional context / 附件

_No response_