Function converts a gtsummary object to a "gt_tbl" object,
that is, a table created with gt::gt().
Function is used in the background when the results are printed or knit.
A user can use this function if they wish to add customized formatting
available via the gt package.
Commands to include in output. Input may be a vector of
quoted or unquoted names. tidyselect and gtsummary select helper
functions are also accepted.
Default is everything().
return_calls
Logical. Default is FALSE. If TRUE, the calls are returned
as a list of expressions.