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CPAlgorithms: add new algorithm for jet reclustering

Baptiste Ravina requested to merge ravinab/athena:jet_reclustering into main

This is migrated from TopCPToolkit; credits to @tdado.

Adding a new algorithm ("JetReclustering" in YAML/ConfigFactory notation) to recluster (kT/anti-kT/Cambridge) small-R jets into large-R jets. This is a first, simple implementation that allows to define these new RC-jets for analysis. By default we save the kinematics of the RC-jets, as well as the indices of the small-R jets that went into them. In the future, this could be expanded to include also b-tagging and substructure information.

An example setup in YAML is

JetReclustering:
  - containerName: 'RCJets'
    jets: 'AnaJets.baselineJvt'
    minPt: 150000
    clusteringAlgorithm: 'Kt'
    reclusteredJetsRadius: 1.2

Thinning:
  - containerName: 'RCJets'
    outputName: 'OutRCJets'
    selectionName: 'passed_pt'
 #- ...

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