Bugs in `cornerplot` and `corrplot`

corrplot and cornerplot doesn't seem to work as described in the README:

julia> using DataFrames, IndexedTables, StatsPlots

julia> df = DataFrame(a = 1:10, b = 10 .* rand(10), c = 10 .* rand(10));

julia> @df df corrplot([:a, :b])
ERROR: MethodError: no method matching AbstractFloat(::Type{Vector{Float64}})

Closest candidates are:
  (::Type{T})(::AbstractChar) where T<:Union{AbstractChar, Number}
   @ Base char.jl:50
  (::Type{T})(::Base.TwicePrecision) where T<:Number
   @ Base twiceprecision.jl:266
  (::Type{T})(::Complex) where T<:Real
   @ Base complex.jl:44
  ...

Stacktrace:
  [1] float(x::Type)
    @ Base ./float.jl:294
  [2] cor(x::Vector{Vector{Float64}})
    @ Statistics ~/.julia/juliaup/julia-1.9.0+0.x64.linux.gnu/share/julia/stdlib/v1.9/Statistics/src/Statistics.jl:722
  [3] macro expansion
    @ ~/.julia/packages/StatsPlots/vq5FV/src/corrplot.jl:45 [inlined]
  [4] apply_recipe(plotattributes::AbstractDict{Symbol, Any}, cp::StatsPlots.CorrPlot)
    @ StatsPlots ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:300
  [5] _process_userrecipes!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline ~/.julia/packages/RecipesPipeline/BGM3l/src/user_recipe.jl:38
  [6] recipe_pipeline!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline ~/.julia/packages/RecipesPipeline/BGM3l/src/RecipesPipeline.jl:72
  [7] _plot!(plt::Plots.Plot, plotattributes::Any, args::Any)
    @ Plots ~/.julia/packages/Plots/esM5q/src/plot.jl:223
  [8] #plot#188
    @ ~/.julia/packages/Plots/esM5q/src/plot.jl:102 [inlined]
  [9] plot
    @ ~/.julia/packages/Plots/esM5q/src/plot.jl:93 [inlined]
 [10] #corrplot#41
    @ ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:380 [inlined]
 [11] corrplot(args::Vector{Vector{Float64}})
    @ StatsPlots ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:380
 [12] add_label(argnames::Vector{String}, f::Function, args::Vector{Vector{Float64}}; kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ StatsPlots ~/.julia/packages/StatsPlots/vq5FV/src/df.jl:181
 [13] add_label(argnames::Vector{String}, f::Function, args::Vector{Vector{Float64}})
    @ StatsPlots ~/.julia/packages/StatsPlots/vq5FV/src/df.jl:167
 [14] (::var"#5#6")(296::DataFrame)
    @ Main ./none:0
 [15] top-level scope
    @ REPL[10]:1

julia> @df df cornerplot([:a, :b])
ERROR: MethodError: no method matching AbstractFloat(::Type{Vector{Float64}})

Closest candidates are:
  (::Type{T})(::AbstractChar) where T<:Union{AbstractChar, Number}
   @ Base char.jl:50
  (::Type{T})(::Base.TwicePrecision) where T<:Number
   @ Base twiceprecision.jl:266
  (::Type{T})(::Complex) where T<:Real
   @ Base complex.jl:44
  ...

Stacktrace:
  [1] float(x::Type)
    @ Base ./float.jl:294
  [2] cor(x::Vector{Vector{Float64}})
    @ Statistics ~/.julia/juliaup/julia-1.9.0+0.x64.linux.gnu/share/julia/stdlib/v1.9/Statistics/src/Statistics.jl:722
  [3] macro expansion
    @ ~/.julia/packages/StatsPlots/vq5FV/src/cornerplot.jl:7 [inlined]
  [4] apply_recipe(plotattributes::AbstractDict{Symbol, Any}, cp::StatsPlots.CornerPlot)
    @ StatsPlots ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:300
  [5] _process_userrecipes!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline ~/.julia/packages/RecipesPipeline/BGM3l/src/user_recipe.jl:38
  [6] recipe_pipeline!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline ~/.julia/packages/RecipesPipeline/BGM3l/src/RecipesPipeline.jl:72
  [7] _plot!(plt::Plots.Plot, plotattributes::Any, args::Any)
    @ Plots ~/.julia/packages/Plots/esM5q/src/plot.jl:223
  [8] #plot#188
    @ ~/.julia/packages/Plots/esM5q/src/plot.jl:102 [inlined]
  [9] plot
    @ ~/.julia/packages/Plots/esM5q/src/plot.jl:93 [inlined]
 [10] #cornerplot#56
    @ ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:380 [inlined]
 [11] cornerplot(args::Vector{Vector{Float64}})
    @ StatsPlots ~/.julia/packages/RecipesBase/BRe07/src/RecipesBase.jl:380
 [12] add_label(argnames::Vector{String}, f::Function, args::Vector{Vector{Float64}}; kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ StatsPlots ~/.julia/packages/StatsPlots/vq5FV/src/df.jl:181
 [13] add_label(argnames::Vector{String}, f::Function, args::Vector{Vector{Float64}})
    @ StatsPlots ~/.julia/packages/StatsPlots/vq5FV/src/df.jl:167
 [14] (::var"#7#8")(300::DataFrame)
    @ Main ./none:0
 [15] top-level scope
    @ REPL[11]:1

One immediate fix is to overload to_corrplot_matrix and to_cornerplot_matrix for AbstractVector{<:AbstractVector{<:Real}}, but given that this is an example in the README, this doesn't seem like it should be necessary?

Has something changed in Plots maybe? As in, it now expects a matrix rather than a vector of vectors?

Deps

```julia (jl_Jg2gEW) pkg> st --manifest Status `/tmp/jl_Jg2gEW/Manifest.toml` [621f4979] AbstractFFTs v1.3.1 [1520ce14] AbstractTrees v0.4.4 [79e6a3ab] Adapt v3.6.2 [7d9fca2a] Arpack v0.5.4 [13072b0f] AxisAlgorithms v1.0.1 [d1d4a3ce] BitFlags v0.1.7 [49dc2e85] Calculus v0.5.1 [d360d2e6] ChainRulesCore v1.16.0 [aaaa29a8] Clustering v0.15.2 [944b1d66] CodecZlib v0.7.1 [35d6a980] ColorSchemes v3.21.0 [3da002f7] ColorTypes v0.11.4 [c3611d14] ColorVectorSpace v0.9.10 [5ae59095] Colors v0.12.10 [34da2185] Compat v4.6.1 [f0e56b4a] ConcurrentUtilities v2.2.0 [d38c429a] Contour v0.6.2 [a8cc5b0e] Crayons v4.1.1 [9a962f9c] DataAPI v1.15.0 [a93c6f00] DataFrames v1.5.0 [864edb3b] DataStructures v0.18.13 [e2d170a0] DataValueInterfaces v1.0.0 [e7dc6d0d] DataValues v0.4.13 [8bb1440f] DelimitedFiles v1.9.1 [b4f34e82] Distances v0.10.8 [31c24e10] Distributions v0.25.91 [ffbed154] DocStringExtensions v0.9.3 [fa6b7ba4] DualNumbers v0.6.8 [c87230d0] FFMPEG v0.4.1 [7a1cc6ca] FFTW v1.6.0 [1a297f60] 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OrderedCollections v1.6.0 [90014a1f] PDMats v0.11.17 [69de0a69] Parsers v2.5.9 [b98c9c47] Pipe v1.3.0 [ccf2f8ad] PlotThemes v3.1.0 [995b91a9] PlotUtils v1.3.5 [91a5bcdd] Plots v1.38.11 [2dfb63ee] PooledArrays v1.4.2 [aea7be01] PrecompileTools v1.1.1 [21216c6a] Preferences v1.4.0 [08abe8d2] PrettyTables v2.2.4 [1fd47b50] QuadGK v2.8.2 [c84ed2f1] Ratios v0.4.4 [3cdcf5f2] RecipesBase v1.3.4 [01d81517] RecipesPipeline v0.6.12 [189a3867] Reexport v1.2.2 [05181044] RelocatableFolders v1.0.0 [ae029012] Requires v1.3.0 [79098fc4] Rmath v0.7.1 [6c6a2e73] Scratch v1.2.0 [91c51154] SentinelArrays v1.3.18 [992d4aef] Showoff v1.0.3 [777ac1f9] SimpleBufferStream v1.1.0 [66db9d55] SnoopPrecompile v1.0.3 [a2af1166] SortingAlgorithms v1.1.0 [276daf66] SpecialFunctions v2.2.0 [90137ffa] StaticArrays v1.5.25 [1e83bf80] StaticArraysCore v1.4.0 [82ae8749] StatsAPI v1.6.0 ⌅ [2913bbd2] StatsBase v0.33.21 [4c63d2b9] StatsFuns v1.3.0 [f3b207a7] StatsPlots v0.15.5 [892a3eda] StringManipulation v0.3.0 ⌅ 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libblastrampoline_jll v5.7.0+0 [8e850ede] nghttp2_jll v1.48.0+0 [3f19e933] p7zip_jll v17.4.0+0 ```

JuliaPlots / StatsPlots.jl

Bugs in `cornerplot` and `corrplot` #538