anand76 7259e28d91 MultiGet parallel IO (#5464)
Summary:
Enhancement to MultiGet batching to read data blocks required for keys in a batch in parallel from disk. It uses Env::MultiRead() API to read multiple blocks and reduce latency.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5464

Test Plan:
1. make check
2. make asan_check
3. make asan_crash

Differential Revision: D15911771

Pulled By: anand1976

fbshipit-source-id: 605036b9af0f90ca0020dc87c3a86b4da6e83394
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