Export `check_args()` for developers of custom models

[mattheaphy]

Feature

check_args() is an internal generic function that is used by parsnip models to validate that parameters have reasonable values before a model is fit.

For developers of custom parsnip models, it would be nice if this function was exported so that appropriate S3 methods could be written to validate parameters on any new models.

[simonpcouch]

I agree with you! Will look into this.

In the spirit of https://github.com/tidymodels/parsnip/issues/826.🐛

[mattheaphy]

Thank you!

[github-actions]

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