Ability to create a new color palette

[JosiahParry]

I'd like to be able to provide say 5 colors as hex codes as a new palette. Then I'd be able to use that new hypothetical palette with palette_dynamic() to get the color interpolation. E.g

my_pal <- palette_new(c("red", "white", "blue"))

palette_dynamic(my_pal, n = 5)