[Feature Request]: Support creating a folder and manager workflow in the sidebar workflows panel.

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

Right now, the workflow panel does not support creating a folder directly. Even if users have manually created a folder in `user/workflows/`, they still cannot directly drag other workflows into the folder. Some users in the WeChat group said they want a better workflow manager experience.

1. Support creating folders in the panel.
2. Support moving workflows into folders in the panel.
3. It would be great if they could just save the workflow output as a workflow, since the image already has a workflow in its metadata.
4. Support thumbnail will be great.

### Proposed workflow

Here are some demos.



### Additional information

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-3560-Feature-Request-Support-creating-a-folder-and-manager-workflow-in-the-sidebar-workf-1dd6d73d365081709c83e0bfcbc3a8f8) by [Unito](https://www.unito.io)