Configurable ANNSvc and expose PR descriptor names

Nicole Skidmorerequested to merge
exp_Spruce_LHCb into master

These are required changes for the sprucing

  • We can have a HltANNSvc for writing and reading. Some algorithms assumed default ANNSvc
  • PersistRecoPacking now has a unpackers_by_key method exposing the descriptor names

See also Moore!763 (merged)

Edited by Rosen Matev

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