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prevents crash for double upgrade after v19
Also load correct information for lsn (64 bit instaed of 32 bit)

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closes #5864 add compression, decompression, serialization, deserialization statistics to engine status. all interesting code paths should be covered.


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fixes #5762 oldest_referenced_xid and oldest_referenced_xid_known now share a prefix, which makes searching for them together a little easier


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- widely adopt the use of ybt abstractions instead of raw dbt management. TODO: the loader and the descriptor are still manually managed.
- remove templates from the perf framework in favor of explicit key size checks that more accurately describe "How Keys/Vals Work", and prevent type related bugs.
- also: removed some dead code, refs #5101



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