Trivial Description
As a followup from discussion in https://github.com/apache/spark/pull/29804#discussion_r493229395 , currently for `FileSourceScanExec` explain output, there's no information to indicate whether the table is read as bucketed table. And if not read as bucketed table, what's the reason behind it. Add this info into `FileSourceScanExec` explain output, can help users/developers understand query plan more easily without spending a lot of time debugging why table is not read as bucketed table.
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