hist should work on categorical inputs

[asinghvi17]

Feature description

hist fails on categorical inputs, either Strings or values wrapped in Categorical.

grain = rand(["clay", "silt", "sand"], 36)
hist(grain)
hist(Categorical(grain))

Ideally, what I posted above would "just work". The input to hist is arguably all along the x axis, so maybe expanding dimensions could fix it?

It currently fails at:

  [8] pick_hist_edges(vals::CategoricalVector{String, UInt32, String, CategoricalValue{String, UInt32}, Union{}}, bins::Int64)
    @ Makie ~/.julia/dev/Makie/src/stats/hist.jl:151

The current workaround for this is

using StatsBase
pcm = collect(pairs(StatsBase.countmap(grain)))
barplot(Categorical(first.(pcm)), last.(pcm))