add control_parsnip

[topepo]

instead of fit_control() and soft-deprecate that.

[DavisVaughan]

Maybe ctrl_parsnip()? in workflows its ctrl_workflow(). ctrl_fit() might be confusing because it might sounds like it could be used in parsnip or workflows

[DavisVaughan]

control_parsnip()?

[github-actions]

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