`service add` and `service list` #1169

Job	Run time
System (1.22.x, add)	33m 54s
Code	1m 48s
System (1.22.x, instances)	6h 0m 13s
System (1.22.x, basic)	1h 2m 4s
System (1.22.x, recover)	19m 55s
System (1.22.x, interactive)	2h 2m 30s
documentation-checks / Run documentation checks	2m 13s
System (1.22.x, mismatch)	20m 22s
System (1.22.x, preseed)	23m 27s
Trigger snap edge build	0s
	10h 46m 26s

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