Commits on Jan 25, 2022

1. spanconfigsqltranslator: populate protected_timestamps in SpanConfig …

   This change teaches the SQLTranslator to hydrate the SpanConfigs
   for a table with protected timestamps that apply to that table.
   
   Concretely, this change initializes a spanconfig.ProtectedTimestampStateReader
   in the txn in which the translation is taking place, thereby
   providing a transactional view of the system.protected_ts_records
   table. After generating the span configurations based on the zone
   configurations that apply to the table, we hydrate the newly
   introduced protected_timestamps field on each span configuration
   with all the protected timestamps that apply to this table. This
   includes protected timestamp records that directly target this
   table, as well as records targetting the table's parent database.
   This information is obtained from the ProtectedTimestampStateReader
   mentioned above.
   
   Additionally, this change modifies StartTenant to allow secondary
   tenants to interact with the protected timestamp subsystem using a
   "real" protectedts.Provider provided the migration
   EnableProtectedTimestampsForTenant has run.
   
   For testing purposes, this change teaches the data driven framework
   of two additional commands protect and release.
   
   Informs: cockroachdb#73727
   
   Release note: None

   

   adityamaru committed Jan 25, 2022
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