Sort LHCbIDs before returning std::vector<LHCb::LHCbID>

Michel De Cianrequested to merge
decianm-sortIDs into master

Sort LHCbIDs in PrTrack and v3::Tracks classes before returning std::vector<LHCb::LHCbID>.

Needed for a proper clone killing in the (upcoming) clone killing with v3::Tracks.

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