Commits on Oct 20, 2021

1. spanconfig: introduce the spanconfig.SQLWatcher …

   The SQLWatcher is intended to incrementally watch for events on
   system.zones and system.descriptors. It establishes rangefeeds on these
   tables from a given checkpoint to do so. It buffers events until the
   next checkpoint. These buffered events, along with the new checkpoint
   timestamp, are passed to the handler callback.
   
   The SQLWatcher uses an eventBuffer helper struct to buffer rangefeed
   updates. This thing maintains the notion of a checkpoint timestamp,
   whcih is the minimum timestamp for {zone,descriptor} checkpoint
   events.
   
   These interfaces aren't hooked up to interact with eachother yet.
   That's forthcoming in a future patch.
   
   References cockroachdb#67679
   
   Release note: None

   

   arulajmani committed Oct 20, 2021
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