* chore: add /v2 to import module path
go mod requires semantic versioning with versions greater than 1.x
This was a mechanical update by running:
```
go install github.com/marwan-at-work/mod/cmd/mod@latest
mod upgrade
```
Migrate generated files to import /v2
* Fix gen
* feat: send native system notification on scheduled workspace shutdown
This commit adds a fairly generic notification package and uses it
to notify users connected over SSH of pending workspace shutdowns.
Only one notification will be sent at most 5 minutes prior to the scheduled
shutdown, and only one CLI instance will send notifications if multiple
instances are running.
