Add a legend to a Mapbox GL map

Usage

add_legend(
  map,
  legend_title,
  values,
  colors,
  type = c("continuous", "categorical"),
  circular_patches = FALSE,
  position = "top-left"
)

map: A map object created by the mapboxgl function.
legend_title: The title of the legend.
values: The values being represented on the map (either a vector of categories or a vector of stops).
colors: The corresponding colors for the values (either a vector of colors or an interpolate function).
type: one of "continuous" or "categorical"
circular_patches: Logical, whether to use circular patches in the legend.
position: The position of the legend on the map (one of "top-left", "bottom-left", "top-right", "bottom-right").

The updated map object with the legend added.