Add tests

See merge request goodrichgroup/common_utils!3

Removed run_brownian_neighbor_list_unsafe since run_brownian_neighbor_list is now differentiable due to a change in jax-md.

Changed tooltip of run_minimization_while_neighbor_list. It is now differentiable due to a change in jax-md.

Added Carl's notebook that demonstrates several different ways of doing energy minimization and brownian dynamics simulations.

Added Carl's lattice creation routines. Still need to fix the fact that there are different make_lattice functions.

Added vector2symmat and vector2symmat_diag0 to utils. Still need to write better error messages for these functions.

for testing only, delete later

See merge request !2