[HBASE-23723] Ensure MOB compaction works in optimized mode after snapshot clone - ASF JIRA

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HFiles written for a MOB enabled column family now store metadata with a multimap of TableAtWrite -> MOB HFile name for all cells within.

The additional information about the original table is used to properly locate the written hfiles during the write amplification optimized compaction process.

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 HFiles written for a MOB enabled column family now store metadata with a multimap of TableAtWrite -> MOB HFile name for all cells within. The additional information about the original table is used to properly locate the written hfiles during the write amplification optimized compaction process.