Change Constraints Convention

[electronsandstuff]

This PR changes the constraint convention of ParetoBench from g(x) >= 0 representing a feasible individual to g(x) <= 0 being feasible. Many popular multi-objective optimization libraries also use this convention and standardizing will help users avoid confusing problems with the sign of their constraints not being correct.

The changes to accommodate this are the following.

• All constrained problems had their constraints flipped when returning from _call
• The default constraint direction in Population was changed to "<"
• Population.g_canonical was modified to use the g<0 style constraint
• History._from_h5py_group was modified to load experiments with file version 1.0.0 as having constraint direction ">". This should ensure compatibility with previously saved files.
• The domination calculation in src/paretobench/utils.py was updated to use the new constraint definition.
• Some tests which assumed the direction of the constraints had to be modified.