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Summary: Add Temperature hints information from RocksDB in API `NewSequentialFile()`. backup and checkpoint operations need to open the source files with `NewSequentialFile()`, which will have the temperature hints. Other operations are not covered. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9499 Test Plan: Added unittest Reviewed By: pdillinger Differential Revision: D34006115 Pulled By: jay-zhuang fbshipit-source-id: 568b34602b76520e53128672bd07e9d886786a2f