Independent placement of labels in coord_axes_inside()

[teunbrand]

This PR aims to fix #167.

devtools::load_all("~/packages/ggh4x/")
#> ℹ Loading ggh4x
#> Loading required package: ggplot2

dat <- expand.grid(
  id = letters[1:3],
  time = 1:50 * 2
) |> cbind(y = rnorm(150))

ggplot(dat, aes(x = time, y = y)) +
  geom_line() +
  facet_grid(cols = vars(id)) +
  coord_axes_inside(labels_inside = "x") +
  theme_classic()

^{Created on 2024-11-16 with reprex v2.1.1}