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This PR adds an API to live-reconfigure the VirtualFile io engine. It also adds a flag to `pagebench get-page-latest-lsn`, which is where I found this functionality to be useful: it helps compare the io engines in a benchmark without re-compiling a release build, which took ~50s on the i3en.3xlarge where I was doing the benchmark. Switching the IO engine is completely safe at runtime.