Implement refetchDebounce option for realtime #refetch

[mattliving]

Option to only trigger a refetch on the final trigger within a timeframe.

Useful when a realtime refetch hits an expensive endpoint and you only need the latest data (i.e., api/tasks on home/sidebar), but there is a possibility that multiple realtime events will trigger refetches in a small timeframe (because of a multi patch for example).