refactor: add try except for logging validation errors

[jackapbutler]

Summary

While working on the training & validation pipelines we often see validation errors with certain configuration parameters but given the size of GPT-NeoX's NeoXArgs class it is very time consuming to track down which key / value caused the error.

If we introduce a try ... except catch during field validation it should make debugging a lot easier and reduce the search space when identifying flaws in the configuration.