Co-Authored-By: Brandan <b5@n0.computer>

Release Notes:

- Added a new action `terminal::Toggle` that is by default bound to
'ctrl-\`'. This copies the default behaviour from VSCode and Jetbrains
where the terminal opens and closes correctly. If you'd like the old
behaviour you can rebind 'ctrl-\`' to `terminal::ToggleFocus`

Co-authored-by: Brandan <b5@n0.computer>