Add ProbNNx functors

Added functors corresponding to all ProbNN quantities defined in ProtoParticle.

Part of Functor writing campaign https://gitlab.cern.ch/lhcb-dpa/project/-/issues/61

Test DaVinci!549 (merged) depends on it

Changes:

• Tracklike templated functor ProbNN in !2471 (diffs)
• Definition of ProbNN_MU, E, K... functors in !2471 (diffs)
• Extended test of DummyTrack in !2471 (diffs)
• Added test on LHCb::Particle in !2471 (diffs)

cc @mferrill