Add Gaussian harness #674

Job	Run time
🐍 3.7 • Psi4-1.5 • ubuntu-latest	2m 31s
🐍 3.10 • Psi4-1.6 • ubuntu-latest	2m 4s
🐍 3.12 • Psi4-1.8 • windows-latest	4m 10s
🐍 3.8 • ANI • ubuntu-latest	1m 7s
🐍 3.8 • OpenMM • ubuntu-latest	1m 17s
🐍 3.10 • xTB • ubuntu-latest	40s
🐍 3.7 • QCore • ubuntu-latest	1m 22s
🐍 3.8 • NWChem70 • ubuntu-20.04	57s
🐍 3.12 • NWChem • ubuntu-latest	47s
🐍 3.8 • MRChem • ubuntu-latest	48s
🐍 3.8 • ADCC • ubuntu-latest	57s
🐍 3.8 • optimization-dispersion • ubuntu-latest	2m 23s
🐍 3.11 • optimization-dispersion • windows-latest	5m 18s
🐍 ${{ matrix.cfg.python-version }} • ${{ matrix.cfg.label }}	0s
	24m 21s

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