Create a lambda module for testing

[ryanmrichard]

Many of the methods we are interested in require computing the energy of a molecule using several basis sets.

• In tests/python/integration_tests/composichem/test_with_nwx.py the basis set is set to 'sto-3g'.
• Rerun the calculation in test_with_nwx.py three times, once for each of the following basis sets: 'aug-cc-pvdz', 'aug-cc-pvtz', and 'aug-cc-pvqz'. For each calculation print out the value of 'egy' and note it.
• In tests/python/unit_tests/composichem/ create a Python file which contains a module satisfying the AOEnergy property type that looks at the basis set and molecule it is given and returns the correct energy.
  • Hints on writing the module: https://nwchemex.github.io/PluginPlay/tutorials/index.html
  • Hints on creating an AOBasisSet object: https://github.com/NWChemEx/Chemist/blob/master/tests/python/unit_tests/basis_set/test_ao_basis_set.py#L126 ("name" on 145 should be 'aug-cc-pvdz' for running the calculation with 'aug-cc-pvdz', 'aug-cc-pvtz' for using 'aug-cc-pvtz', etc.