Ability to set allow_extra_keys for non-ray runs

[KMouratidis]

Reminder

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Description

In the huggingface parser, when the configuration is passed, unhandled configs are separated into unknown_args and then they raise an error unless allow_extra_keys is set to True. This parameter is set to True for ray but none of eval, infer, or train. Since these arguments are not passed down, it seems to me that raising the value error could become optional. Having custom key-value pairs in the config can help when writing automation or services on top of llama-factory, without having 2+ configuration sources.

Pull Request

No response

[hiyouga]

Use env var ALLOW_EXTRA_ARGS=1