Add parallel benchmark: Quicksort

[Sudha247]

Source: https://github.com/ckoparkar/ocaml-benchmarks/blob/master/qsort.ml

Sandmark also has a quick sort which would nice to compare against. (https://github.com/ocaml-bench/sandmark/blob/main/benchmarks/multicore-numerical/quicksort_multicore.ml)

[Abdulrahim2567]

Hi @Sudha247, may I work on this?

[Sudha247]

Sure, you can go ahead. Please not that the benchmarks in the repo are written for an older version of domainslib and may require updating. Don't hesitate to post here if you have any questions on errors or building the benchmark.

[Abdulrahim2567]

Sure @Sudha247 I'll get in touch if I get confused along the way or encounter any errors on the build. Thanks a lot for the endless support.