violinplot not defined

Maybe I missed something, but `violinplot` (https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.violinplot.html) should surely be defined?
```julia
julia> import PyPlot as plt

julia> plt.violinplot(rand(100))
ERROR: UndefVarError: `violinplot` not defined
Stacktrace:
[1] getproperty(x::Module, f::Symbol)
@ Base ./Base.jl:31
[2] top-level scope
@ REPL[2]:1

julia>
```
Other plotting types work just fine.

I am using Julia 1.10.0 and `PyPlot.jl` 2.11.2.

Reproduce the Julia 1.10.0 failure with PyPlot.jl 2.11.2, then inspect how PyPlot exposes matplotlib.pyplot plotting functions. Compare violinplot with the plotting types that work and add coverage for the reported call. Done means plt.violinplot(rand(100)) resolves and the regression test passes.

Escrito por el modelo de indexación a partir del texto del issue.