Add a new per level counter for block cache hit (#4796)
Summary: Add a new per level counter for block cache hits, increase it by one on every successful attempt to get an entry from cache. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4796 Differential Revision: D13513688 Pulled By: zinoale fbshipit-source-id: 104df038f1232e3356e162eb2d8ca138e34a8281
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