Implement BatchSemaphore which is able to accept batch tokens
Summary: In addition to `folly::fibers::Semaphore` which only accepts single token increment/decrement. `folly::fibers::BatchSemaphore` is able to accept batch tokens Differential Revision: D21874795 fbshipit-source-id: 1d4c62bdb079c058529cd917078d81d09d585084
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