Load a checkpoint file from wandb directly into a potential.

[chrisiacovella]

Pull Request Summary

It would be convenient to be able to setup a potential directly from a checkpoint file on weights and biases. This PR implements such functionality.

Key changes

Notable points that this PR has either accomplished or will accomplish.

• This PR adds a function to the NeuralNetworkPotentialFactory that will download the file and call the load_inference_model_from_checkpoint function, returning a potential.

Questions

• I'm not sure the best way to test this since it will require credentials to access Wandb. For now I've marked the test to skip on GitHub. Obviously won't work if someone is not part of the project, but that is fine. This is just for convenience of us sharing models during development and testing.

Associated Issue(s)

• Load from weights and biases directly #310

Pull Request Checklist

• Issue(s) raised/addressed and linked
• Includes appropriate unit test(s)
• Appropriate docstring(s) added/updated
• Appropriate .rst doc file(s) added/updated
• PR is ready for review

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.

Project coverage is 34.18%. Comparing base (dbae94c) to head (ee7e6cf).

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Flag	BASE (dbae94c)	HEAD (ee7e6cf)
unittests	8	1

Additional details and impacted files

[chrisiacovella]

I'm just going to merge this because it doesn't make any really substantial changes.