Commits on Feb 3, 2022

1. spanconfigsql{watcher,reconciler}: setup SQLWatcher to watch for pts … …

   …updates
   
   This change sets up a rangefeed on the `system.pts_records` table,
   and adds this to the set of rangefeeds managed by the SQLWatcher. We
   switch the unit emitted by the SQLWatcher to a union type called
   `SQLUpdate` which captures either an update to a descriptor or to a
   protected timestamp target. The zones and descriptor table rangefeeds
   will continue to emit descriptor updates. The pts rangefeed will emit
   descriptor updates for records that target schema objects, and pts target
   updates for records that target cluster or tenants.
   
   The SQLWatcher continues to dedup the SQLUpdates that it emits, so as to
   ensure there is only one SQLUpdate per descriptor ID, and one SQLUpdate
   per cluster or tenant target. The reconciler registers a handler that
   is invoked everytime a batch of SQLUpdates are emitted by the SQLWatcher.
   There is change in semantics in this part of the code, a future PR will teach
   the reconciler to parse the pts target SQLUpdates, and in turn instruct the
   SQLTranslator to generate the appropriate `SystemSpanConfigs`.
   
   Note, this file moves the sqlwatcher tests into a ccl package so as to be
   able to run backup statements to test the rangefeed on the pts table.
   
   Informs: cockroachdb#73727
   
   Release note: None

   

   adityamaru committed Feb 3, 2022
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