Add a continuous legend

Usage

add_continuous_legend(
  map,
  legend_title,
  values,
  colors,
  position = "top-left",
  unique_id = NULL,
  add = FALSE,
  width = NULL
)

map: A map object created by the mapboxgl function.
legend_title: The title of the legend.
values: The values being represented on the map (vector of stops).
colors: The colors used to generate the color ramp.
position: The position of the legend on the map (one of "top-left", "bottom-left", "top-right", "bottom-right").
unique_id: A unique ID for the legend container. Defaults to NULL.
add: Logical, whether to add this legend to existing legends (TRUE) or replace existing legends (FALSE). Default is FALSE.
width: The width of the legend. Can be specified in pixels (e.g., "250px") or as "auto". Default is NULL, which uses the built-in default.

The updated map object with the legend added.