Commits on Oct 1, 2021

1. spanconfig: introduce spanconfig.StoreWriter (and its impl) …

   In cockroachdb#69172 we introduced a spanconfig.StoreReader interface to abstract
   away the gossiped system config span. We motivated that PR by teasing
   a future implementation of the same interface, an in-memory data
   structure to maintain a mapping between between spans and configs
   (powered through a view over system.span_configurations introduced in
   \cockroachdb#69047). This PR introduces just that.
   
   Intended (future) usages:
   - cockroachdb#69614 introduces the KVWatcher interface, listening in on
     system.span_configurations. The updates generated by it will be used
     to populate per-store instantiations of this data structure, with an
     eye towards providing a "drop-in" replacement of the gossiped system
     config span (conveniently implementing the sibling
     spanconfig.StoreReader interface).
   - cockroachdb#69661 introduces the SQLWatcher interface, listening in on changes to
     system.{descriptor,zones} and generating denormalized span config
     updates for every descriptor/zone config change. These updates will
     need to be diffed against a spanconfig.StoreWriter populated with the
     existing contents of KVAccessor to generate the "targeted" diffs
     KVAccessor expects.
   
   Release note: None

   

   irfansharif committed Oct 1, 2021
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