[Feature Request]: Basic Workflows Management

### 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 ?

The current state of Workflows Manager offers very little when it comes to managing workflows. It is still not possible to perform basic operations such as Create | Edit | Delete folders/subfolders and move workflows.

Not to mention that when renaming a workflow within a subfolder, the workflow is moved to the main one (as reported here https://github.com/Comfy-Org/ComfyUI_frontend/issues/1146), making it even more difficult to keep everything organized.

Many users like me come from [comfyui_workspace_manager](https://github.com/11cafe/comfyui-workspace-manager). Workspace has been a very good plug-in with many useful features, so our standards have become pretty high in terms of management.

There are other features you can get inspired by Workspace, but in this specific request I ask to implement the basics.

### Proposed workflow

In Workflows Manager you can:

- Create folders and subfolders
- Edit folder names
- Delete folders
- Move workflows within a folder/subfolder
- Move workflows out of a folder/subfolder

And you can also customize folders as in Node Library:


### Additional information

It's funny that you can better manage folders in Node Library but not in Workflows! 😆