New 'Last Seen' value when starting sessions

We've added a Last Seen value to session starts — giving you an easy way to see when a player was last active.

This value can be used in a variety of ways, like tracking engagement or rewarding login streaks.

This value is returned from all of our start session endpoints under the key last_seen, in player metadata with the key ll.last_seen or can be accessed through the SDK on session start.