Update DB::AddFile() to have less restrictions
Summary: Update DB::AddFile() restrictions to be - Key range in loaded table file don't overlap with existing keys or tombstones in DB. - No other writes happen during AddFile call. The updated AddFile() will verify that the file key range don't overlap with any keys or tombstones in the DB, and then add the file to L0 Test Plan: unit tests Reviewers: igor, rven, anthony, kradhakrishnan, sdong Reviewed By: sdong Subscribers: adsharma, ameyag, dhruba Differential Revision: https://reviews.facebook.net/D49233
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