allowing for any class to be passed to tbl_summary

[ddsjoberg]

What changes are proposed in this pull request?
This PR allows columns of any class to be summarized by tbl_summary().

Outstanding items:

• Do more testing with dates, times, datetimes, and lubridates (including quarters within lunbridate)
• Can we improve error messaging if users sends column so a summary function that cannot handle it?
• Still need to remove custom ordered factors code.
• You can pass dates now, but there is no way to format them 🤷
• We open ourselves up to a whole new set of errors that are difficult to anticipate by accepting a column of any class.
  • We need to add more informative error messaging, but that is actually hard to do.
  • We could add a column to .$meta_data indicating if the column is a base R type/class. When there are errors with non-base types, we could pass a special error message.

Haven labelled example

tibble::tibble(
  s1 = haven::labelled(c("M", "M", "F"), c(Male = "M", Female = "F")), 
  s2 = haven::labelled(c(1, 1, 2), c(Male = 1, Female = 2)), 
  s3 = haven::labelled(c(1, 1, 2), c(Male = 1, Female = 2),
                       label="Assigned sex at birth")
) %>%
  tbl_summary(
    type = list(c(s2, s3) ~ "continuous")
  )

If there is an GitHub issue associated with this pull request, please provide link.

closes #569
closes #488
closes #540

---

Checklist for PR reviewer

• PR branch has pulled the most recent updates from master branch. Ensure the pull request branch and your local version match and both have the latest updates from the master branch.
• If an update was made to tbl_summary(), was the same change implemented for tbl_svysummary()?
• If a new function was added, function included in _pkgdown.yml
• If a bug was fixed, a unit test was added for the bug check
• Run pkgdown::build_site(). Check the R console for errors, and review the rendered website.
• Code coverage is suitable for any new functions/features. Review coverage with covr::report(). Before you run, set Sys.setenv(NOT_CRAN = TRUE) and begin in a fresh R session without any packages loaded.
• R CMD Check runs without errors, warnings, and notes
• NEWS.md has been updated with the changes from this pull request under the heading "# gtsummary (development version)". If there is an issue associated with the pull request, reference it in parantheses at the end update (see NEWS.md for examples).
• usethis::use_spell_check() runs with no spelling errors in documentation
• When the branch is ready to be merged into master, increment the version number using usethis::use_version(which = "dev"), run codemetar::write_codemeta(), approve, and merge the PR.

[ddsjoberg]

@karissawhiting this is not pressing in any way. But when you have a chance can you begin testing and give feedback?

[ddsjoberg]

/document

[ddsjoberg]

closing in favor of PR #794