Add `Snapshot` prefix to sensor and electrical component states#341

tiyash-basu-frequenz merged 2 commits intofrequenz-floss:v0.x.xfrequenz-floss/frequenz-api-common:v0.x.xfrom

tiyash-basu-frequenz:326_snapshottiyash-basu-frequenz/frequenz-api-common:326_snapshotCopy head branch name to clipboard