add type argument to autoplot.workflowset()

[simonpcouch]

Closes #114.

Unsure whether we should add an argument like this PR does or just change the default behavior. Also, I don't feel confident in the names of the argument values.🤔

library(tidymodels)

mt_rec <- recipe(mpg ~ ., mtcars)
mt_rec2 <- mt_rec %>% step_normalize(all_numeric_predictors())
mt_rec3 <- mt_rec %>% step_YeoJohnson(all_numeric_predictors())

wflow_set <-
   workflow_set(list(mt_rec, mt_rec2, mt_rec3), list(linear_reg()))

set.seed(1)
wflow_set_fit <- 
   workflow_map(
      wflow_set, 
      "fit_resamples", 
      resamples = bootstraps(mtcars), 
      seed = 1
   )

autoplot(wflow_set_fit, type = "wflow_id")

^{Created on 2023-11-29 with reprex v2.0.2}

[simonpcouch]

No need to review for the nitty gritty until we feel that the overall approach is sound.

[EmilHvitfeldt]

I really like the new type. But I don't have strong feelings about making it the default.

I wish documentation was better

[topepo]

Looks great. No notes.

[jrosell]

I really like the new type. But I don't have strong feelings about making it the default.

I wish documentation was better

IMHO, it could be a better default.