Broaden the string-to-Arrow benchmarks - #9372
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Merging this PR will improve performance by 11.71%
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Rework `vortex-arrow`'s string export benchmarks into a matrix over encoding (offset, view, FSST, OnPair, Zstd), structure (flat, dict, chunked), operator (identity, filter, take, slice, mask, zip), and nullability, exported to both Arrow offset and view layouts, plus the same cases appended directly into `VarBinBuilder` and `VarBinViewBuilder`. Add a `string_to_arrow` benchmark in `vortex` that measures the end-to-end file scan producing Arrow offset arrays, so the export is also covered with data laid out by the default compressor rather than by hand. Signed-off-by: Robert Kruszewski <github@robertk.io>
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Stacked on #9371.
Broaden string to arrow benchmarks to codify the currently optimised set of exporters, taken from #9339