This patch adds 2 methods on `RoomInfo`: `new_latest_event_timestamp`
and `new_latest_event_is_local`, which respectively returns
`LatestEventValue::timestamp` and `LatestEventValue::is_local`. The goal
is to avoid cloning a `LatestEventValue` when it's useless. For example,
in the room list sorters!
This patch also updates the room list sorters `recency` and
`latest_event` to use these new methods. It improves the speed and
throughput by 18%.
Ivan Enderlin
62eb1996d9