希望可以使两个目录的文件自动同步

### Please make sure of the following things

- [X] I have read the [documentation](https://alist.nn.ci).
- [ ] 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

实现选择2个或多个目录，在上传时自动复制去其它的储存，在删除时同步删除

### Suggested solution / 实现思路

_No response_

### Additional context / 附件

_No response_