Add lock wait time as a perf context counter
Summary: Adds two new counters: `key_lock_wait_count` counts how many times a lock was blocked by another transaction and had to wait, instead of being granted the lock immediately. `key_lock_wait_time` counts the time spent acquiring locks. Closes https://github.com/facebook/rocksdb/pull/3107 Differential Revision: D6217332 Pulled By: lth fbshipit-source-id: 55d4f46da5550c333e523263422fd61d6a46deb9
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