Adds support for AVX2 for 32-bit types for quicksort and quickselect - #60
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Reviewed only changes in the common qsort file.
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LGTM. Thank you @sterrettm2!
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This patch adds support for AVX2 for 32-bit data types (int32_t, uint32_t, float) for quicksort and quickselect. It also includes benchmarks and tests for these. Below is a comparison of the performance: