Add rdkit to CI requirements

setup/continuous_integration.sh

@@ -7,6 +7,6 @@ python -m pip install torch-scatter torch-geometric -f https://data.pyg.org/whl/
 # Requirements to run
 python -m pip install numpy pandas hydra-core tqdm torchtyping scikit-learn
 # Conditional requirements to run
-python -m pip install wandb matplotlib plotly pymatgen pyxtal torchani
+python -m pip install wandb matplotlib plotly pymatgen pyxtal torchani rdkit
 # Test and code formatting packages
 python -m pip install black isort pytest pytest-repeat