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engine: introduce SstWriterBuilder #5211
What have you changed? (mandatory)
Introduce SstWriterBuilder, it builds a SstWriter which support building an in-memory SST.
For now, no one uses in-memory sst, it is added for backup, it helps backup increasing throughput by not performing any IO operation.
What are the type of the changes? (mandatory)
How has this PR been tested? (mandatory)
Does this PR affect documentation (docs) or release note? (mandatory)
Does this PR affect tidb-ansible update? (mandatory)