accept allow_par in control_last_fit()

[simonpcouch]

control_last_fit() doesn't accept an allow_par argument, and sets it to TRUE by default when wrapping control_resamples. This causes issues after last_fit() for models that need native serialization methods to be passed between sessions.

I'd suggest we

1. add an allow_par argument to control_last_fit(), and
2. set its default to FALSE

I don't believe 2) would result in any slowdown for last_fit(), as there's only one fit occurring on the train fold of a train/test split. It would also allow users to last_fit() without needing to set allow_par for model engines that require native serialization.

Reprex and more discussion in tidymodels/bonsai#52 (comment).

[github-actions]

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