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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refs #5801 merge 5801 (improve threaded stress test framework) to main: now the loader is used for sufficiently large tables, correctness tests fill tables with zeroes while performance tests fill them with bytes based on compressibility, and both use similar code paths for key/val generation for better consistency and readability


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Modified loader-stress-test-4z (row count /= 10, row size *= 10) to make it faster in valgrind

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