Include ggrepel geoms in use_sgplot

[alice-hannah]

For example, set geom defaults for geom_text_repel (in addition to geom_text).

[alice-hannah]

The following only works if ggrepel is loaded:

ggplot2::update_geom_defaults(
    geom = "text_repel",
    new = list(colour = "black",
               size = base_size / ggplot2::.pt)
)

Is it worth extra faff of checking package is loaded, etc.? How would it work if somebody had ggrepel installed, not loaded and instead used ggrepel::geom_text_repel()?