Add QCManyBody and GenOptKing harnesses

[loriab]

Description

Most of this is now covered in #466 — calling QCManyBody as a procedure and letting it call QCEngine programs for its inputs. This allows interaction energies or many-body expansions to arbitrary order with none, counterpoise, or VMFC basis set superposition error corrections. The "genopt" part is letting geometry optimizers act on a counterpoise-corrected gradient. This requires the OptimizationInput qcschema to specify manybody directions instead of single-point directions. This was handled through a "GeneralizedOptimizationInput/Result" for the QCManyBody paper, requiring schema in QCManyBody repo and geometric and optking harnesses here. But QCSchema v2 is going to handle this cleanly, so we're not going to push the genopt into master here.

Changelog description

Status

• [ ] Code base linted
• [ ] Ready to go

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Additional details and impacted files