tbl_uvregression() to accept survey objects

[ddsjoberg]

What changes are proposed in this pull request?

• tbl_uvregression() now accepts both data frames and survey objects as input.
  closes Add support for survey objects with tbl_uvregression() #742

tt <- survey::svydesign(~1, data = as.data.frame(Titanic), weights = ~Freq) 

tbl <- 
  tt %>%
  tbl_uvregression(
    y = Survived,
    method = survey::svyglm,
    method.args = list(family = binomial),
    hide_n = TRUE
  )
tbl

---

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.
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• If a new function was added, function included in _pkgdown.yml
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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 parantheses at the end update (see NEWS.md for examples).
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• Approve Pull Request
• Merge the PR. Please use "Squash and merge".

[ddsjoberg]

@larmarange would you mind reviewing this pull request please? Anytime we're working with survey objects, I feel somewhat nervous! Thank you!

[larmarange]

add [survey::svyglm] in the list of possibilities ?

[larmarange]

For me it looks OK. However, as is, it appears to be a hidden feature. I would simply update documentation. (cf comments)

Otherwise, this is great!!! :-)

[larmarange]

Add a third example in the examples using a survey object

[ddsjoberg]

@larmarange thank you so so so much!