Commits on Jul 19, 2023

1. ssmemstorage: improve lock contention on RecordStatement …

   1. The stats object lock was being held even during the insights event
   creation and insert which has it's own lock. The insights logic is now
   moved above the stats lock.
   2. Moved latency calculation outside the stats lock.
   3. Moved error code calculation outside the stats lock.
   4. ss_mem_storage converted to use a RWMutex. Each object in the map
   has it's own lock. Read lock allows mulitple threads to read from the
   map at the same time which is the common case. Writes are only done the
   first time a statement is seen.
   
   Fixes: #106789, Fixes: #55285
   
   Release note (performance improvement): Reduced lock contention on
   `ssmemstorage.RecordStatement`. This is useful for workloads that
   execute the same statement concurrently on the same SQL instance.

   j82w committed Jul 19, 2023
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