Should element_rect() and element_line() also use `linewidth` instead of `size`?

[yutannihilation]

#3672 introduced linewidth to Geoms. On the other hand, element_rect() and element_line() still uses size. Do we need to rename them for consistency?

Currently, this doesn't work.

library(ggplot2)

ggplot(mpg, aes(x = hwy, y = cty, color = drv)) +
  geom_point() +
  theme(
    legend.key = element_rect(linewidth = 3, colour = "red")
  )
#> Error in element_rect(linewidth = 3, colour = "red"): unused argument (linewidth = 3)

^{Created on 2022-08-22 with reprex v2.0.2}

[thomasp85]

I think we should, but we should be careful to properly deprecate the size argument... I can take a stab at this