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Replace
BlockManagerwithFileSystem, replaceReadableBlockwithFileReader, replace WritableBlock with FileWriter, and removed remove dependency on Env. Move some StorageBackend interface(upload, download, ...) to RemoteFileSystem.- Rewrites Rewrite rowset write IO path, uses use FileSystem, FileWriter, FileReader related interface.
- Replace all Env, FileUtils related calls with FileSystem interface.
- Unify FileReader and FileWriter in the query layer with filesystem layer FileReader, FileWriter.