violin_stats simpler method parameter

The method parameter of violin_stats may now be specified as tuple of strings, and has a new default ("GaussianKDE", "scott"). Calling violin_stats followed by violin is therefore now equivalent to calling violinplot.

import matplotlib.pyplot as plt
from matplotlib.cbook import violin_stats
import numpy as np

rng = np.random.default_rng(19680801)
data = rng.normal(size=(10, 3))

fig, (ax1, ax2) = plt.subplots(ncols=2, layout='constrained', figsize=(6.4, 3.5))

# Create the violin plot in one step
ax1.violinplot(data)
ax1.set_title('One Step')

# Process the data and then create the violin plot
vstats = violin_stats(data)
ax2.violin(vstats)
ax2.set_title('Two Steps')

plt.show()

(Source code, 2x.png, png)