Add a command to collapse all entires (#2813)

Release Notes:

- Added a `project panel: collapse all entries` command
([#158](https://github.com/zed-industries/community/issues/158)).
525c8dacbcJoseph T. Lyons committed on 7/29/2023, 2:44:08 AM· committed by GitHubparents46269812c47efc
1 file changedLine totals unavailable