When the JS SDK encounters a new room it will emit a flurry of events for things
like state and room members. Refreshing the room list on each event is bad for
performance. This is okay initially because the room list is only shown after
the first sync, but when getting archived rooms it locks up for 15-30s as it
thrashes. Add a 1s cap to refreshRoomList() which means that it will refresh
*AT MOST* once every second. If it has been >1s since the last refresh it will
immediately refresh. If it has been <1s it will wait the difference.
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