Fix relaxations for FAENet and add EquiformerV2 model

[Ramlaoui]

Two new features were added here because they were simultaneously being tested:

• Possibility to run relaxations on any FAENet S2EF model
• EquiformerV2 model is now available from the original ocp repository, and it is also possible to run relaxations on the model

A continue_from_dir.sh script was added to the scripts folder to run these relaxations, here is how we can for example run relaxations on FAENet:

./scripts/continue_from_dir.sh $S2EF_JOBID run-relaxations faenet-is2re-all

[Ramlaoui]

Update the branch to add:

• Ewald summation on three models: FAENet, SchNet and DimeNet++
• Merge with parts of the untrained cano updates
• Fine-tuning and transfer learning of models

[Ramlaoui]

Tests pass (except for qm7x which were not working on main branch as well) and canonicalization is also compatible with old frame_averaging arguments