Rotate x-axis labels by default for plot method for `check_outliers()`

[rempsyc]

For the outliers paper, we have to add manual ggplot2 code to the plot method for check_outliers() so that the labels don't overlap. Reprex:

library(performance)
library(see)

x <- check_outliers(mtcars)
plot(x)

# Correction:
plot(x) + 
  ggplot2::theme(axis.text.x = ggplot2::element_text(
    angle = 45, size = 8
  ))

^{Created on 2024-01-24 with reprex v2.0.2}

Would it make sense to make this the default?

Later on we can tackle #262 properly but for now that should be an improvement already?

[IndrajeetPatil]

Alternatively, we could use n.dodge argument and set it to 2.

[rempsyc]

Result for reference:

library(performance)
library(see)

x <- check_outliers(mtcars)
plot(x) + 
  ggplot2::guides(x = ggplot2::guide_axis(n.dodge = 2))

^{Created on 2024-01-24 with reprex v2.0.2}

Yeah I think it could work too