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Create pile-up events hash and store it in xAOD::EventInfo (ATLASSIM-3795)

Tadej Novak requested to merge tadej/athena:pileup-hash into 21.0

It might be useful to have an information how many pile-up events repeat in an analysis (e.g. we get exactly the same mixture of minbias events). This MR adds a 128-bit MD5 hash of pile-up info to the xAOD::EventInfo objects.

Migrated from https://gitlab.cern.ch/atlas/athenaprivate1/merge_requests/14958

/cc @akraszna @jchapman

Edited by Tadej Novak

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