GH-44072: [C++][Parquet] Add Float16 reading benchmarks (#44073) Local benchmark numbers: ``` --------------------------------------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations UserCounters... --------------------------------------------------------------------------------------------------------------------------- BM_ReadColumnPlain/null_probability:-1 20038480 ns 20019703 ns 36 bytes_per_second=1.9512Gi/s items_per_second=523.772M/s BM_ReadColumnPlain/null_probability:0 37114403 ns 36766588 ns 19 bytes_per_second=1.06245Gi/s items_per_second=285.198M/s BM_ReadColumnPlain/null_probability:1 44589582 ns 44371707 ns 16 bytes_per_second=901.475Mi/s items_per_second=236.316M/s BM_ReadColumnPlain/null_probability:50 65624754 ns 65322683 ns 11 bytes_per_second=612.345Mi/s items_per_second=160.522M/s BM_ReadColumnPlain/null_probability:99 43072631 ns 42932582 ns 16 bytes_per_second=931.693Mi/s items_per_second=244.238M/s BM_ReadColumnPlain/null_probability:100 36710045 ns 36475141 ns 19 bytes_per_second=1.07093Gi/s items_per_second=287.477M/s BM_ReadColumnPlain/null_probability:-1 52718868 ns 52616204 ns 12 bytes_per_second=380.111Mi/s items_per_second=199.288M/s BM_ReadColumnPlain/null_probability:0 71273144 ns 71093105 ns 10 bytes_per_second=281.321Mi/s items_per_second=147.493M/s BM_ReadColumnPlain/null_probability:1 80674727 ns 80358048 ns 8 bytes_per_second=248.886Mi/s items_per_second=130.488M/s BM_ReadColumnPlain/null_probability:50 138249159 ns 137922632 ns 5 bytes_per_second=145.009Mi/s items_per_second=76.0264M/s BM_ReadColumnPlain/null_probability:99 86938382 ns 86576176 ns 8 bytes_per_second=231.01Mi/s items_per_second=121.116M/s BM_ReadColumnPlain/null_probability:100 74154244 ns 73984356 ns 9 bytes_per_second=270.327Mi/s items_per_second=141.729M/s ``` * GitHub Issue: #44072 Authored-by: Antoine Pitrou Signed-off-by: Antoine Pitrou

[C++][Parquet] Add Float16 reading benchmarks #44072

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