List available palette names
Examples
list_palettes()
#> [1] "default" "byor" "gyor" "ylord" "ylgnbu"
#> [6] "blues" "greens" "reds" "oranges" "purples"
#> [11] "bupu" "orrd" "rdylgn" "rdbu" "spectral"
#> [16] "piyg" "viridis" "magma" "plasma" "redblue"
#> [21] "bluered" "redgreen" "greenred" "yellowred" "yellowblue"
#> [26] "whiteblue" "whitered" "whitegreen"
