Ability to collapse all top-level folders in project panel

[mikesun]

Check for existing issues

• [X] Completed

Describe the feature

The current project panel: collapse all entries function will only collapse folders of children of top-level folders but doesn't collapse all top-level folders, which is different from how Collapse Folders in Explorer works in VScode. VScode's behavior is useful because I often have many top-level folders in the project panel.

If applicable, add mockups / screenshots to help present your vision of the feature

Zed

VSCode

[alxhghs]

It would also be great to have a keyboard shortcut for this

[tripplehelix]

Would love a setting to have folders automatically collapsed on start.