Support for snapctl stop/start/restart services

since we can control settings values using snap set and retrieve change using snapctl, sometimes it is required to restart the service for changes to take effect. If snapped application does not have this already built in, there is very little one can do, as systemctl is not accessible from within snap.
This could be easily address by extending snapctl to provide start/stop/restart options for applications defined by the snap. Internally this would likely be wired back to systemctl call

While we can define some level of automation here (e.g. define settings values triggering service restart in snapcraft.yaml), it’s important to support manual option first, no matter how we define automatic option there will be always case which will not be addressed…

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