4×4×4 phase 2 performance experiments

[lgarron]

• Create a definition with centers and wing parity.
  • This can help not only perform less transformation work, but avoids hashing the compound pattern in a tree.
• Implement symmetry class canonicalization and a prune table for wing separation.
• Don't include orientations in the packed representation for orbits with numOrientations == 1 cubing.rs#11
• Measure how slow dynamic dispatch is for search optimizations.