refactor: Use `linewidth` aesthetic for border line widths

[trevorld]

• In line with upstream changes in {ggplot2} a linewidth aesthetic has been introduced and supersedes the size aesthetic for scaling the width of patterned area border lines (#82). size will remain functioning but deprecated for these geoms and it is recommended to update all code to reflect the new aesthetic. Continue to use the size aesthetic to adjust the size of any points in geom_sf_pattern() (and any other geoms which also have points).

closes #82

[trevorld]

geom_sf_pattern() and geom_boxplot_pattern() are only two geoms of ours that uses size aesthetic to adjust size of points.

library(ggpattern)
ns <- asNamespace("ggpattern")
geoms_names <- ls(ns, pattern = "Geom.*")
geoms <- lapply(geoms_names, \(x) get(x, ns))

idx <- vapply(geoms, \(x) {
  all(c("linewidth", "size") %in% x$aesthetics())
}, logical(1L))

geoms_names[idx]

[1] "GeomBoxplotPattern" "GeomSfPattern" 

All {ggpattern} Geoms now have rename_size = TRUE:

```r
idx <- vapply(geoms, \(x) {
  x$rename_size }
, logical(1))

geoms_names[idx] # same as `geoms_names`

 [1] "GeomAreaPattern"     "GeomBarPattern"      "GeomBoxplotPattern" 
 [4] "GeomColPattern"      "GeomCrossbarPattern" "GeomDensityPattern" 
 [7] "GeomMapPattern"      "GeomPolygonPattern"  "GeomRectPattern"    
[10] "GeomRibbonPattern"   "GeomSfPattern"       "GeomTilePattern"    
[13] "GeomViolinPattern"  

[trevorld]

{ggplot2} v3.4.0 has finally hit CRAN