Test ProteinMPNN score for multimer metrics

[broomsday]

• [x] function to score a structure using ProteinMPNN
• [x] allow moving a single chain away from the COM by 100 angstroms to roughly score ddG
• [x] score using this
• [x] check if this score has a useful correlation
• [x] add to docker and publish

[broomsday]

Intending to just test this directly on the structures from the metric test rather than trying to code it into the design, only worry about later if it looks promising

[broomsday]

Still need to implement the part where the dd-MPNN score is computed.