Commits on Nov 28, 2023

1. pebble: add global sync to MemFS …

   This commit introduces MemFS.Sync method which persists the entire
   filesystem. It makes it possible to emulate a process crash and restart,
   as follows:
   
   ```
   fs.Sync()                        // capture/snapshot the filesystem
   fs.SetIgnoreSyncs(true)          // prevent changes from taking effect
   db.Close()                       // shutdown, with no writes taking effect
   fs.ResetToSyncedState()          // rollback to the snapshot
   strictFS.SetIgnoreSyncs(false)   // allow changes again
   db = Open(..., &Options{FS: fs}) // reopen on top of the reverted data
   ```

   

   pav-kv committed Nov 28, 2023
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