Support freeze / thaw services

[sanchezcarlosjr]

Thank you for the awesome project, it brings a lot to the community.

Why?

Similarly as kill handles the signals CONT and STOP with traditional process management, systemd supports freezing and thawing services. This allows suspending a service, and afterward resuming it. Contrary to the kill program, systemd suspend the whole process tree and offers more fine control. So, this feature is really handy and brings more usefulness to the systemctl-tui project.

Description

Add systemctl freeze --unit X and systemctl thaw --unit X as freeze and thaw options in the Actions menu.

[rgwood]

Seems like a good idea. I probably won’t implement this myself (don’t need it right now) but I’d be open to a PR.