Commits on Jan 5, 2023

1. [ios] Fix offline-related crash …

   It seems like the reason for the crash in 4836 is concurrent access
   to the db pointer. When we run into the outdated credentials we close
   the db and it can happen while another operation is running. The crash
   was happening when get() would check that db is open and copy the db
   handle, the db would be closed in the meantime and then get() would
   fail when it would try to use the db. The only way to prevent this is
   to make all db usage serial and we achieve this by using actor. This
   probably impacts the performance because there can be no more concurrent
   calls but we believe that the impact is minimal in practice.
   
   fix #4836

   

   charlag committed Jan 5, 2023
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