Rename `at` arguments into `by`

[strengejacke]

https://github.com/easystats/easystats/issues/404

[DominiqueMakowski]

Thanks Daniel :)

[strengejacke]

I hope all relevant code pieces are updated now. Still some failing checks, due to report, where we also need to make changes. Renaming the arguments throughout all packages will cause some uneasiness when submitting all updates to CRAN, I guess ;-)

[strengejacke]

@DominiqueMakowski The examples I removed in this commit are even not working with the current CRAN version of modelbased - it's not related to this PR.

[strengejacke]

This error occurs when ggplot2 is loaded after poorman (https://github.com/easystats/modelbased/actions/runs/9209112782/job/25332884239):

Caused by error:
! cannot xtfrm data frames
Backtrace:
     ▆
  1. └─... %>% summarise(RT = mean(RT))
  2.   └─base::eval(rhs_call, envir = list(. = lhs), enclos = parent.frame())
  3.     └─base::eval(rhs_call, envir = list(. = lhs), enclos = parent.frame())
  4.       ├─poorman::summarise(., RT = mean(RT))
  5.       └─poorman:::summarise.grouped_df(., RT = mean(RT))
  6.         └─poorman:::groups_set(res, groups[-n], group_by_drop_default(.data))
  7.           └─poorman:::calculate_groups(x, groups, drop)
  8.             ├─...[]
  9.             ├─tibble:::`[.tbl_df`(...)
 10.             ├─base::do.call(...)
 11.             └─base (local) `<fn>`(`<tibble[,1]>`, `<tibble[,1]>`)
 12.               └─base::lapply(z, function(x) if (is.object(x)) as.vector(xtfrm(x)) else x)
 13.                 └─base (local) FUN(X[[i]], ...)
 14.                   ├─base::as.vector(xtfrm(x))
 15.                   ├─base::xtfrm(x)
 16.                   └─base::xtfrm.data.frame(x)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 59.11330% with 83 lines in your changes are missing coverage. Please review.

Project coverage is 36.39%. Comparing base (b4692b9) to head (ec683fd). Report is 3 commits behind head on main.

:exclamation: Current head ec683fd differs from pull request most recent head aabb649

Please upload reports for the commit aabb649 to get more accurate results.

Files	Patch %	Lines
R/estimate_slopes.R	16.00%	21 Missing :warning:
R/get_emmeans.R	68.08%	15 Missing :warning:
R/visualisation_recipe.estimate_means.R	0.00%	13 Missing :warning:
R/visualisation_recipe.estimate_slopes.R	0.00%	10 Missing :warning:
R/get_emtrends.R	70.00%	6 Missing :warning:
R/visualisation_matrix.R	0.00%	6 Missing :warning:
R/get_marginaleffects.R	60.00%	4 Missing :warning:
R/estimate_means.R	66.66%	3 Missing :warning:
R/estimate_contrasts.R	92.85%	2 Missing :warning:
R/get_emcontrasts.R	90.47%	2 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #255 +/- ## ========================================== + Coverage 35.96% 36.39% +0.42% ========================================== Files 25 25 Lines 1190 1220 +30 ========================================== + Hits 428 444 +16 - Misses 762 776 +14 ```

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