CPAlgorithms: additional variables for photons

Baptiste Ravinarequested to merge
ravinab/athena:extra_photon into main

Introduce a new config block PhotonExtraVariablesBlock (labelled "Photons.ExtraVariables" in YAML) to save the photon conversion type and calorimeter eta to the output - these are needed for photon categorisation and fake background estimation.

The algorithm has been written and tested by @niabicht in TopCPToolkit. (Nils: I made the variables systematic-independent, is that correct?)

It can be scheduled in YAML very simply

Photons:
- containerName: 'AnaPhotons'
  ExtraVariables: {}
  WorkingPoint:
  - ...
Edited by Baptiste Ravina

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