Add Bounds to Container Objects

[electronsandstuff]

This PR adds variable bounds to the Population object.

• Add var_lower_bounds and var_upper_bounds fields to Population
  • Implemented as numpy array
  • Validation for array shape, type, and that lower bound is less than upper bound
  • Default to (-inf, inf) when unspecified
• Bugfix for upper bound of CONSTR problem
• Problem calls include bounds in results
• Bounds are used in decision variable plots
• Load bounds in Xopt importer tool
• Update type annotation in containers.py
• Update test workflow on MacOS/linux to fail on test failure. Fix location of coverage test