Improvement of workflows grouping and naming

From a user's feedback:

- Useful to people to be able to group workflows together as if they had folders, with a nice interface (someone is working already on this I understood)

- Possibility of naming the executed/running workflows, as if they were "files", and show those names in the group/folder, so it's easier for people to retrieve older calculations (e.g. by assigning the metadata.label, as expose it in a user-friendly fashion)

pinning @unkcpz @superstar54 for some idea. I will think about that too