make _distinguishable_colors public ? #573

personally I am a user of the "private" _distinguishable_colors method because I can pass a specific subset of colors candidate::Vector{Lab{Float32}} to choose from.
What do you think about making it public, i.e. exporting it or just renaming it to distinguishable_colors ?

Ofc, to make it more user friendly a candidate::AbstractVector{<:Color} should be passed and a conversion should happen internally, along with some other default arguments similarly to distinguishable_colors.