Draft: Implement loop search on the event level for FixHepMC without barcodes

Andrii Verbytskyirequested to merge
averbyts/athena:FixFixHepMC into main

Implement loop search on the event level for FixHepMC without barcodes. The idea is

  • Avoid the usage of barcode ordering
  • Search for the loops in the event only once and cache results

@pclark @ewelina @jchapman

Edited by John Derek Chapman

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