New Manifest format to allow customized fields in NewFile.
Summary: With this commit, we add a new format in manifest when adding a new file. Now path ID and need-compaction hint are first two customized fields. Test Plan: Add a test case in version_edit_test to verify the encoding and decoding logic. Add a unit test in db_test to verify need compaction is persistent after DB restarting. Reviewers: kradhakrishnan, anthony, IslamAbdelRahman, yhchiang, rven, igor Reviewed By: igor Subscribers: javigon, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D48123
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