feat: Enable using thread_rng for faster WyHash initialisation
#8
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Adds a new feature flag to allow the use of
thread_rngfor initialisingWyHash. Using a user-space PRNG source adds a lot less overhead, which then enables faster hashing from start to finish. Withgetrandomalone, the initialisation takes around 237ns. Withthread_rng, this takes around 8.1ns.