Move away from stl vector in primal

[davidgunderman]

George @gzagaris suggested looking into using numerics::Matrix or axom::Array instead of std::vector in BezierCurve and associated classes.

[kennyweiss]

I think our axom::Array implementation is sufficiently advanced at this point for us to start chipping away at this ticket

[kennyweiss]

https://github.com/LLNL/axom/search?q=std%3A%3Avector+primal

[rhornung67]

If there is a systematic way to do this incrementally, instead of one big change, it would be good to describe it here. Possibly with a checkbox task list?