3897ce3125
Summary: This PR add support for Merge operation in Integrated BlobDB with base values(i.e DB::Put). Merged values can be retrieved through DB::Get, DB::MultiGet, DB::GetMergeOperands and Iterator operation. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8292 Test Plan: Add new unit tests Reviewed By: ltamasi Differential Revision: D28415896 Pulled By: akankshamahajan15 fbshipit-source-id: e9b3478bef51d2f214fb88c31ed3c8d2f4a531ff