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Summary: **Context/Summary:** This PR adds new stats to measure compaction readahead size for rocksdb managed prefetching (not FS prefetching). It can be used to verify compaction read-ahead is doing what's configured. This PR also excludes compaction readahead stats from user scan readahead stats measured in existing stats so there is a cleaner separating between these two. Bonus: this PR also included some typo fixing about "io activities" Pull Request resolved: https://github.com/facebook/rocksdb/pull/13520 Test Plan: Modified existing test to verify stats Reviewed By: archang19 Differential Revision: D72892850 Pulled By: hx235 fbshipit-source-id: 1a73182061baa044c9c9193a2b0fd967ffe75c4a