[Feature] Group sessions into user-created folders within a workspace

[Saneman1-kz]

UX improvement suggestion

I suggest adding the ability to group sessions within a workspace into folders (folders created by the user).

Why?

A common workflow is tackling several different tasks at once, and a single task may span multiple sessions covering different aspects of it. It would be handy to see the sessions for one task side by side.

[Saneman1-kz]

A couple of extra arguments for "Why":
Sessions on a long-running task often have to be paused for a long time — days or weeks, for example when digging into complex bugs — and then picked up again when new information comes in.

The workspace itself can't serve as that folder: one workspace corresponds to a product, and it already contains a lot of tasks.