Adapt to tracks containers with flexible sizes

Adapt the tracking algorithms according to the new tracks containers defined with SOACollection.

Involve the tracking algorithms and converters, etc.

In addition, fix a bug in PrVeloUT.

Should go with LHCb!2733 (merged) and Phys!792 (merged). Refs links in Moore!631 (merged)

Could you please review and comment on the changes I make? Thanks! @sstahl @decianm @ahennequ