Add Gaussian harness #667

Job	Run time
🐍 3.7 • Psi4-1.5 • ubuntu-latest	6m 46s
🐍 3.10 • Psi4-1.6 • ubuntu-latest	6m 6s
🐍 3.12 • Psi4-1.8 • windows-latest	10m 39s
🐍 3.8 • ANI • ubuntu-latest	1m 42s
🐍 3.8 • OpenMM • ubuntu-latest	2m 10s
🐍 3.10 • xTB • ubuntu-latest	1m 4s
🐍 3.7 • QCore • ubuntu-latest	1m 47s
🐍 3.8 • NWChem70 • ubuntu-20.04	4m 39s
🐍 3.12 • NWChem • ubuntu-latest	9m 2s
🐍 3.8 • MRChem • ubuntu-latest	10m 32s
🐍 3.8 • ADCC • ubuntu-latest	4m 58s
🐍 3.8 • optimization-dispersion • ubuntu-latest	3m 19s
🐍 3.11 • optimization-dispersion • windows-latest	14m 15s
🐍 ${{ matrix.cfg.python-version }} • ${{ matrix.cfg.label }}	0s
	1h 16m 59s

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