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HepMCWeightSvc+GenInterfaces+GeneratorObjectsTPCnv: Make HepMCWeightSvc thread-safe.

Scott Snyder requested to merge ssnyder/athena:mtWeightSvc.HepMCWeightSvc-20220324 into master

Rework HepMCWeightSvc to be thread-safe.

Interface IHepMCWeightSvc updated: weightNames() now returns the map by value. Add weightNameVec(). Methods take an optional EventContext. Use DeclareInterfaceID.

TPCnv updates: Use weightNameVec() in HEPMC3 case to avoid reformatting on each event. Pass EventContxt to IHepMCWeightSvc methods. Unit tests now need to set up an EventContext.

See ATLASRECTS-6859.

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