Introduce CPU timers for iterator seek and next (#5076)
Summary: Introduce CPU timers for iterator seek and next operations. Seek counter includes SeekToFirst, SeekToLast and SeekForPrev, w/ the caveat that SeekToLast timer doesn't include some post processing time if upper bound is defined. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5076 Differential Revision: D14525218 Pulled By: fredfsh fbshipit-source-id: 03ba25df3b22b06c072621e4de0eacfa1445f0d9
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