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  1. Replace BlockManager with FileSystem, replace ReadableBlock with FileReader, replace WritableBlock with FileWriter, and removed remove dependency on Env. Move some StorageBackend interface(upload, download, ...) to RemoteFileSystem.

  2. Rewrites Rewrite rowset write IO path, uses use FileSystem, FileWriter, FileReader related interface.
  3. Replace all Env, FileUtils related calls with FileSystem interface.
  4. Unify FileReader and FileWriter in the query layer with filesystem layer FileReader, FileWriter.