Modify ParticleCombination to make the type independent of the number of particles, remove DOCA{,Chi2} computation from combinations classes

• basically, change std::array to std::vector while keeping the 'outer' class backwards compatible
• change is required to be able to create a ParticleCombination from a (composite) LHCb::Particle
• remove computation of DOCA{,Chi2} from the combinations, and move it into relevant functors themselves
• add interfaces to combinations to allow the above point, namely: get, transform_reduce, pairwise_transform_reduce, pairwise_none_of
• double the number of doca-related functors: one set which uses a simple 'one state only' computation (prefixed with S, eg. SDOCA, with S for 'state'), and one set, the old and new default (which uses the IDistanceCalculator tool instead) -- but the latter only works for LHCb::Particle as the interface doesn't accept v2 classes...

Requires LHCb!3404 (merged), Moore!1301 (merged)

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• bbbea61e - Move computation of DOCA{,Chi2} related quantities from 'combinations' to...

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changed title from Draft: Modify ParticleCombination to make the type independent of the number of particles to Draft: Modify ParticleCombination to make the type independent of the number of particles, remove DOCA{,Chi2} computation from combinations classes

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mentioned in merge request LHCb!3396 (closed)

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@lmeyerga: can we please test this for (just) the platform needed for the throughput test?

/ci-test --platform=x86_64_v3-centos7-gcc11-opt+g

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• [2022-02-02 19:23] Validation started with lhcb-master-mr#3610

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• 04507ea1 - Implement option to use any IDistanceCalculator tool in DistanceOfClosestApproach functor

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• 24d1a345 - Implement option to use any IDistanceCalculator tool in DistanceOfClosestApproach functor

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• f5dc297a - Implement option to use any IDistanceCalculator tool in DistanceOfClosestApproach functor

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• 0af137fd - Require specification of 'fast' or 'suitable for long distances' computation in DOCA

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• b51eb23e - DOCA uses 'fast' for everything, LLDOCA uses IDistanceCalculator for two...

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• [2022-02-03 22:32] Validation started with lhcb-master-mr#3621
• [2022-02-04 11:42] Validation started with lhcb-master-mr#3624

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mentioned in commit Moore@abdf0719

mentioned in merge request Moore!1301 (merged)

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