Add pion+ track reconstruction benchmark

I'm seeing failures on pion reconstruction. @marratia is seeing very different performance for pions and electrons.

assigned to @wdconinc

requested review from @cpeng

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• 4bd7fae2 - Use PxPyPzMVector::P() for total momentum

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• dadfb330 - tracking_performancy analysis --nametag

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• f6fbaecd - Central pions in c++

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• c9a29b44 - Enable central_pions

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• 933f3d00 - Rename central_pions.sh

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• 8fec9116 - Rename rec/gen_central_pions.cxx

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• 42eba1ac - Units pion mass in GeV

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enabled an automatic merge when the pipeline for 42eba1ac succeeds

merged