Add pretty_value p values to the pairwise functions.

[wfulp]

adding the option to allow pretty p values to output as an additional column in the binary and continuous. This was already added to the pairwise correlation function:

  if (pretty_pval && any(!is.na(final_results$CorrTest)))
    final_results$`CorrTest_Pretty` = pretty_pvalues(final_results$CorrTest,
                                                     digits = pretty_digits,
                                                     ...)

Here the params pretty_pval and pretty_digits were added in the function