Add option to produce confidence interval using estimates

[craig-parylo]

plot_or() uses {broom}'s confidence interval (conf.int) methods which can take a while to calculate when working on large datasets. Adding an option for approximating the CI using a formula using a faster method would be helpful, particularly when reviewing models prior to agreeing a 'final' one.

See also
This issue raised on the GH pages for boom on this matter: tidymodels/broom#989
The related PR where this matter was resolved: tidymodels/broom#1060 (it seems there is an option to add in conf.method parameter)

[craig-parylo]

Note, reading the last PR it seems this effort was abandoned.
Others have https://stackoverflow.com/questions/53091552/fast-wald-confidence-intervals-for-a-glm-with-broom-in-r

[craig-parylo]

See also this article which goes through estimating CIs for binomial models
https://fromthebottomoftheheap.net/2018/12/10/confidence-intervals-for-glms/