add support for parallelism with future #208
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Related to tidymodels/tune#866, but a bit more straightforward here. :)
This PR uses future's RNG scheme when using doFuture; while tune has its own RNG machinery that guarantees reproducibility between sequential and parallel runs, stacks did not. Going ahead and transitioning to future's RNG scheme is thus no more breaking than not doing so, and means that users will see no change when foreach is fully written out in a later release.