Draft: add Kernel/Run2_LHCbKernel and Event/Run2_TrackEvent for track reco in Lamarr
Lamarr requires access to LHCb::Track from Run 2. Take LHCb/run2-patches versions of Kernel/LHCbKernel and Event/TrackEvent, move to Run2_XXXXXX for compilation support, and wrap LHCb::Track as LHCb::Run2::Track to allow simultaneous compilation. Will also allow CellID fix.
Need expert input on if this is preferred method or not.