run systemd edgecore.service in pure go

What would you like to be added/modified: when we run keadm beta join command to start an edge node, we run systemd related commands in our source codes to start edgeocre systemd service, such as https://github.com/kubeedge/kubeedge/blob/bef4c51ee551d315e3eb5e75db4878dd023b867f/keadm/cmd/keadm/app/cmd/edge/joinbeta.go#L250-L254

I find a go package https://github.com/coreos/go-systemd , maybe we could import this package to run edgecore systemd service in pure go

/help /good-first-issue Why is this needed: