Adds a way to select items under multiple carets (#4067)

Deals with https://github.com/zed-industries/community/issues/2374

Release Notes:

- Added a way to select items under multiple carets with
`editor::SelectNext` and `editor::SelectPrevious` commands
ec3cfc33d6Kirill Bulatov committed on 1/16/2024, 9:08:48 AM· committed by GitHubparents47971ec25abe8f
3 files changedLine totals unavailable