Until now, Helix-mode users would have to rely on Vim's `d *` behaviour
which cannot be reliably replicated with Helix's default delete
behaviour and so I believe that remapping this functionality to Helix's
goto mode is a better fit.

Release Notes:

- Added custom mappings for Zed specific diff and git-related actions to
Helix's goto mode:
  * `g o` - toggle selected diff hunks
  * `g O` - toggle staged
  * `g R` - restore change
  * `g u` - stage and goto next diff hunk
  * `g U` - unstage and goto next diff hunk