Evaluate energies with geometric #15
Description
In some cases it may be useful to evaluate conformer energies with geometric instead of OpenMM. @trevorgokey already has some code to do this that could be adopted: https://github.com/MobleyLab/openff-spellbook/blob/a8bef1d5bb9e922533fa32935e39e821fb5e275e/offsb/op/openmm.py#L560-L650