[FT] Support computing/displaying stddev in the final table from the variation in sample scores (when using sampling metrics) instead of a bootstrap

## Issue encountered

I was hoping to run an evaluation with N=5 replicates, as well as an get easy way to get error bars.

## Solution/Feature

Some parameter in `PipelineParameters`.

## Possible alternatives

It's possible that `PipelineParameters.max_samples` does this, but it's unclear to me.