Make printed primal primitives easier to turn into C++ code.

[BradWhitlock]

It is a chore to translate primal primitive printed output into a C++ program. If I'm printing a set of points, vectors, planes, or polygons, it would be nice if there was a code() method that would write the object as valid (or closer to it) C++ code. This would make it easier to export problem data to short programs for debugging.

Example:

template <typename T, int NDIMS>
std::ostream& Vector<T, NDIMS>::code(std::ostream& os, int indentLevel = 0, const char *name = nullptr) const
{
  os << indent(indentLevel) << "axom::primal::Vector";
  os << "<" << cpp2conduit<T>::name << ", " << NDIMS << ">";
  if(name != nullptr) os << " " << name;
  os << "{";
  for(int dim = 0; dim < NDIMS - 1; ++dim)
  {
    os << std::setprecision(20) << static_cast<typename NonChar<T>::type>(m_components[dim]) << ",";
  }
  os << std::setprecision(20) << static_cast<typename NonChar<T>::type>(m_components[NDIMS - 1]) << "}";

  return os;
}

• Make sure Point, Vector print enough precision
• Enabled in non-device code
• Handle Point, Vector, Plane, Polygon, BoundingBox
• For some of these compound types, maybe use constructors that initialize arguments inline: Polygon<double,2>({{0.,1.},{2.,3.},{4.,5.}})
• Bonus: Polyhedron, Curve, and others