This ticket will add statistics for the S3 extension. The following needs to be done:

• Design work for how the statistics will be collected, and which statistics make sense.
• Add a struct in S3 storage for statistic collection.
  • Statistics for each of the S3 operations (i.e. list, put and get object).
  • Statistics for reads from the cache.
  • Statistics for file handle operations.
• Helper routine to dump the stats to the WiredTiger logging.