Support OS notifications long running tasks completing

[fdionisi]

Is your feature request related to a problem? Please describe. Crazy pitch. Sometimes you need some disposable terminals windows that are one shot and they complete fairly quickly. But there are situations in which you still have a one-shot command, but that action will actually take minutes (e.g. apply a terraform configuration).

Describe the solution you'd like Would be great if I could open a terminal modal, with the ability to minimize it. When running a long task, I would get a notification on its completion. Then I can run a new task or close the modal.

Describe alternatives you've considered I could use the integrated terminal and just have a spare terminal there, but I got inspired by the current terminal modal. 😬