better names for tidy results from impute steps

[EmilHvitfeldt]

The information column of the tidy method for prepped step_impute_mean(), step_impute_median(), and step_impute_mode() has the less informative name model which aligns with tidy results from step_impute_mode(). I think these could be better represented with value as is done in step_impute_lower().

library(recipes)
data("penguins", package = "modeldata")

impute_rec <- recipe( ~ ., data = penguins) %>%
  step_impute_lower(body_mass_g) %>%
  step_impute_mean(body_mass_g) %>%
  step_impute_median(body_mass_g) %>%
  step_impute_mode(island) %>%
  prep()

tidy(impute_rec, number = 1)
#> # A tibble: 1 × 3
#>   terms       value id                
#>   <chr>       <dbl> <chr>             
#> 1 body_mass_g  2700 impute_lower_9PeoD
tidy(impute_rec, number = 2)
#> # A tibble: 1 × 3
#>   terms       model id               
#>   <chr>       <dbl> <chr>            
#> 1 body_mass_g 4201. impute_mean_rmJCk
tidy(impute_rec, number = 3)
#> # A tibble: 1 × 3
#>   terms       model id                 
#>   <chr>       <dbl> <chr>              
#> 1 body_mass_g  4050 impute_median_MLNJ4
tidy(impute_rec, number = 4)
#> # A tibble: 1 × 3
#>   terms  model  id               
#>   <chr>  <chr>  <chr>            
#> 1 island Biscoe impute_mode_jJuiD

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