Add hits indices to Pr::Tracks

• Add hits indices ft_index, vp_index, ut_index and lhcbID to PrForwardTracks in PrForwardTracking.cpp and SciFiTrackForwarding.cpp.
• Add lhcbID to PrVeloTracks in VeloClusterTrackingSIMD.cpp.
• Adapt other algorithms and converters accordingly.
• Add residual algorithms PrResidualSciFiHits, PrResidualUTHits and PrResidualVeloTracks to store the residual SciFi/UT hits and PrVeloTracks.
• Update PrAddUTHitsTool to use PrUTHitHandler according to PrVeloUT Algorithm in !2073 (merged), further vectorization is need. (close issue #140 (closed))

These hit indices are used in PrResidualSciFiHits, PrResidualUTHits.

To Do:

• Add both LHCbIDs and indices for UT hits after 'PrAddUTHitsTool' and PrUpstreamTrack updated.
• Update PrResidualSciFiHitsto use indices instead of LHCbIDs.
• Update PrRresidualUTHits to use indices instead of LHCbIDs. Need updates of PrDownstreamTracks.
• Update PrResidualVeloTracks to use track indices instead of LHCbIDs matching.
• Adapt all the hit indices/lhcbID namees to be consistent for all Pr::Tracks.
• Further vectorization in PrAddUTHitsTool algorithm.
• Some clean ups.

should go with LHCb!2561 (merged) Moore!517 (merged) @sstahl @decianm

changed title from WIP: Add hits indices to {-PrForwardTracks-} to WIP: Add hits indices to PrForwardTracks

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mentioned in merge request LHCb!2561 (merged)

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• e0f69675 - add residual hits and tracks algorithms

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• 487df6e6 - change input to be SOA structures

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• 59c0df00 - Fixed formatting

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• c7479445 - change array to dynamic_bitset

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• d620e490 - Fixed formatting

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• ada9e9b3 - change the name of hit indices container

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• 139899f1 - Fixed formatting

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changed title from WIP: Add hits indices to PrForwardTracks to WIP: Add hits indices to Pr::Tracks

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marked the checklist item Adapt all the hit indices/lhcbID namees to be consistent for all Pr::Tracks as completed