Zhongyi Xie aa56b7e74a secondary instance: add support for WAL tailing on OpenAsSecondary
Summary: PR https://github.com/facebook/rocksdb/pull/4899 implemented the general framework for RocksDB secondary instances. This PR adds the support for WAL tailing in `OpenAsSecondary`, which means after the `OpenAsSecondary` call, the secondary is now able to see primary's writes that are yet to be flushed. The secondary can see primary's writes in the WAL up to the moment of `OpenAsSecondary` call starts.

Differential Revision: D15059905

Pulled By: miasantreble

fbshipit-source-id: 44f71f548a30b38179a7940165e138f622de1f10
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