Support SingleDelete for user-defined timestamps (#8921)
Summary: Added support for SingleDelete for user-defined timestamps. Users can now Get and Iterate over keys deleted with SingleDelete. It also includes changes in CompactionIterator which preserves the same user key with different timestamps, unless the timestamp is below a certain threshold full_history_ts_low. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8921 Test Plan: Added new unit tests Reviewed By: riversand963 Differential Revision: D31098191 Pulled By: akankshamahajan15 fbshipit-source-id: 78a59ef4b4884ae324fcd10f56e62a27d5ee2f49
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