survival time to binary conversion

[topepo]

This exports three functions in the standalone file (one function is new). It exports them in a separate file that uses some razzle-dazzle from the sources for with::defer.

Unit tests are here; no more needed in extratests for the new function.

[hfrick]

I've updated the documentation to match the language in the current draft for the tidymodels.org articles. About the unit tests: I've moved them to a file name so that we have that correspondence to the R file name. It's neat to get around the dependency on the survival package for the test by just defining the structure but all the other functions in that file are tested in extratests already. Are you up for me moving the test to extratests so that we only have one place to find those tests?

[topepo]

It's neat to get around the dependency on the survival package for the test by just defining the structure but all the other functions in that file are tested in extratests already. Are you up for me moving the test to extratests so that we only have one place to find those tests?

Sure, that would be good

[hfrick]

Cool, I'll do that and solve the merge conflict in NEWS. Once that's done, I'll merge this PR 👍

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