Add DB property estimated number of keys
Summary: Add a DB property of estimated number of live keys, by adding number of entries of all mem tables and all files, subtracted by all deletions in all files. Test Plan: Add the case in unit tests Reviewers: hobbymanyp, ljin Reviewed By: ljin Subscribers: MarkCallaghan, yoshinorim, leveldb, igor, dhruba Differential Revision: https://reviews.facebook.net/D20631
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