Summary rows no row groups

[olivroy]

Fix #1292 #1420

It is now recommended to use grand_summary_rows(). The error message does a better job to point to the correct solution.

# before
      mtcars %>% dplyr::select(gear) %>% gt::gt(rownames_to_stub = TRUE) %>% gt::summary_rows(
        fns = "sum")
#>      Error:
#>      ! `everything()` must be used within a *selecting* function.
#>     i See <https://tidyselect.r-lib.org/reference/faq-selection-context.html> for details.


# this PR
#>      Error:
#>      ! Since gt v0.9.0, the `groups = everything()` option has been deprecated in `summary_rows()` if no row #> groups are present.
#>       * Use `grand_summary_rows()` instead or add row groups.

[olivroy]

For the moment, I implemented the proposal of #1292, but I think that at this point, it is probably better to deprecate, since this has not worked for a while now.

[olivroy]

The only way I found to figure out if the call was from grand_summary_rows() or not.

[olivroy]

Moving the resolver before has forced me to add the isFALSE() condition in the resolver. The groups = FALSE option is undocumented in summary_rows() groups argument, but I wonder if I missed some other edge cases?

[rich-iannone]

I think you might be fine here.

[rich-iannone]

LGTM!

[rich-iannone]

Thanks! I'll merge once CI is completed.