v2.0 Adding add ci.tbl summary()

[ddsjoberg]

• Adding the add_ci() function.

closes #1569

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Reviewer Checklist (if item does not apply, mark is as complete)

• Ensure all package dependencies are installed by running renv::install()
• 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 withr::with_envvar(new = c("NOT_CRAN" = "true"), covr::report()). Begin in a fresh R session without any packages loaded.
• R CMD Check runs without errors, warnings, and notes
• usethis::use_spell_check() runs with no spelling errors in documentation

When the branch is ready to be merged into master:

• Update NEWS.md 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 parentheses at the end update (see NEWS.md for examples).
• Increment the version number using usethis::use_version(which = "dev")
• Run codemetar::write_codemeta()
• Run usethis::use_spell_check() again
• Approve Pull Request
• Merge the PR. Please use "Squash and merge".

[zdz2101]

@ddsjoberg you hand wrote/programmed the formulas for each method or used stats package:

so for "exact" which is Clopper-Pearson, the proportion_ci_clopper_pearson() in cardx uses stats::binom.test()
and for "asymptotic" which is Agresti-Coull (???) the proportion_ci_agresti_coull() in cardx is handwritten

in fact the Hmisc library is not used anywhere in cardx I swear I thought I saw it somewhere but perhaps I was looking at gtsummary at the time

[zdz2101]

Couple things, I think its pretty intuitive/makes plenty of sense, have to try pretty hard to "break" something