Separate FileHandle and BufferManagedFileHandle #1365
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This PR separates
FileHandleandBufferManagedFileHandle.The former one is used for files that are not managed by BM, and the latter one is for ones managed by BM.
BufferManagedFileHandlesupports both versioned and non-versioned file handles.StorageStructureIDis moved from FileHandle toStorageStructure.StorageStructureIDis mostly used to logically identify the semantic of a storage structure, for example, a node table column. FileHandle shouldn't be aware of those information.