Add an argument of `.pivot_long` to `extract_regression_residuals`

[spsanderson]

Add and argument of .pivot_wide as a boolean (TRUE/FALSE) that will pivot the residuals wide if user desires it to.

Example:

> library(recipes, quietly = TRUE)
> library(tidyAML)
> 
> rec_obj <- recipe(mpg ~ ., data = mtcars)
> 
> fr_tbl <- fast_regression(mtcars, rec_obj, .parsnip_eng = c("lm","glm"),
+                           .parsnip_fns = "linear_reg")
> 
> result <- extract_regression_residuals(fr_tbl)
> 
> purrr::map(result, ~tidyr::pivot_longer(
+   data = .x,
+   cols = -.model_type
+ ))
[[1]]
# A tibble: 96 × 3
   .model_type     name       value
   <chr>           <chr>      <dbl>
 1 lm - linear_reg .actual    21   
 2 lm - linear_reg .predicted 16.6 
 3 lm - linear_reg .resid      4.42
 4 lm - linear_reg .actual    21   
 5 lm - linear_reg .predicted 14.2 
 6 lm - linear_reg .resid      6.82
 7 lm - linear_reg .actual    22.8 
 8 lm - linear_reg .predicted 24.2 
 9 lm - linear_reg .resid     -1.37
10 lm - linear_reg .actual    21.4 
# ℹ 86 more rows
# ℹ Use `print(n = ...)` to see more rows

[[2]]
# A tibble: 96 × 3
   .model_type      name       value
   <chr>            <chr>      <dbl>
 1 glm - linear_reg .actual    21   
 2 glm - linear_reg .predicted 16.6 
 3 glm - linear_reg .resid      4.42
 4 glm - linear_reg .actual    21   
 5 glm - linear_reg .predicted 14.2 
 6 glm - linear_reg .resid      6.82
 7 glm - linear_reg .actual    22.8 
 8 glm - linear_reg .predicted 24.2 
 9 glm - linear_reg .resid     -1.37
10 glm - linear_reg .actual    21.4 
# ℹ 86 more rows
# ℹ Use `print(n = ...)` to see more rows