Add new step_indicate_na()

[konradsemsch]

That's a clear start from: #617

[topepo]

Looks good!

[topepo]

One more thing that I forgot... please add a note to the NEWS file.

[konradsemsch]

Done, should be good to go!

[juliasilge]

@konradsemsch It seems that in the last commit f9cd575 a whole lot of unrelated files got checked in. We only want the files related to this PR checked in, not the .Rd files for other steps, and for example no step_shadow_missing methods in the NAMESPACE. Do you think you can give a go at fixing up this PR?

[konradsemsch]

I just spotted that in the R file:

#' @export
tidy.step_shadow_missing <- function(x, ...) {
  if (is_trained(x)) {

and let me remove it, before I make the change. I think I also committed everything after loading the package locally so let me revert that.

[konradsemsch]

@juliasilge let me know if things are as you would expect and sorry about the previous push clutter 😉

[topepo]

Are all of the changes in for this PR?

[konradsemsch]

All from my side :)

[topepo]

Looks great. Sorry for the lag time. One minor change.

[topepo]

Thanks!

[github-actions]

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