[Feature Request]: Group all pending tasks in Queue tab

### 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 ?

There are suggestions for enhancements to queue useability in the issues list, but none really seem simple/automatic enough.

- Allow collapse of _types_ of task; `pending`, `generated` into a single blob
- Option to collapse by default
- Move the running queue item at the top or bottom - if you have 30 generated images, and 30 more in the queue, you have to scroll halfway to find it

### Proposed workflow

1. Go to queue tab
2. See single square containing all pending items - visually resembles a stack
3. Click > or + or some other obviously-expander button
4. All pending items are now visible - same as current behaviour
5. Click V or - or some other obviously-collapse button
6. Pending tasks are all in the one stack again

Rinse/repeat for history images.

### Additional information

From Discord:

> I think I understand how the queue images work (populating after completion). Might be better if the pending ones were minimized to a single line (or just one full "..." for the processing one)

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-1823-Feature-Request-Group-all-pending-tasks-in-Queue-tab-15f6d73d365081b38a2ef769dfc057a4) by [Unito](https://www.unito.io)