Implement functionality to plot multiple traces per row

[tpvasconcelos]

solves #77

Example plot with multiple traces per row:

Sample code:

import numpy as np
from ridgeplot import ridgeplot
from ridgeplot.datasets import load_lincoln_weather

# Load test data
df = load_lincoln_weather()

# Transform the data into a 3D (ragged) array format of
# daily min and max temperature samples per month
months = df.index.month_name().unique()
samples = [
    [
        df[df.index.month_name() == month]["Min Temperature [F]"],
        df[df.index.month_name() == month]["Max Temperature [F]"],
    ]
    for month in months
]

# And finish by styling it up to your liking!
fig = ridgeplot(
    samples=samples,
    labels=months,
    coloralpha=0.98,
    bandwidth=4,
    kde_points=np.linspace(-25, 110, 400),
    spacing=0.33,
    linewidth=2,
)
fig.update_layout(
    title="Minimum and maximum daily temperatures in Lincoln, NE (2016)",
    height=650,
    width=950,
    font_size=14,
    plot_bgcolor="rgb(245, 245, 245)",
    xaxis_gridcolor="white",
    yaxis_gridcolor="white",
    xaxis_gridwidth=2,
    yaxis_title="Month",
    xaxis_title="Temperature [F]",
    showlegend=False,
)
fig.show()

[codecov-commenter]

Codecov Report

Patch coverage: 58.56% and project coverage change: -2.69% ⚠️

Comparison is base (4843011) 65.63% compared to head (197a67f) 62.95%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   65.63%   62.95%   -2.69%     
==========================================
  Files          11       11              
  Lines         259      386     +127     
  Branches       43       65      +22     
==========================================
+ Hits          170      243      +73     
- Misses         89      140      +51     
- Partials        0        3       +3     

Flag	Coverage Δ
unittests	62.95% <58.56%> (-2.69%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/ridgeplot/_ridgeplot.py	27.77% <29.16%> (-11.12%)	⬇️
src/ridgeplot/_figure_factory.py	32.81% <36.55%> (+9.64%)	⬆️
src/ridgeplot/_utils.py	71.11% <40.90%> (-28.89%)	⬇️
src/ridgeplot/datasets/__init__.py	70.58% <69.23%> (-29.42%)	⬇️
src/ridgeplot/_kde.py	75.00% <70.83%> (+41.66%)	⬆️
src/ridgeplot/_colors.py	96.61% <86.66%> (-3.39%)	⬇️
src/ridgeplot/_testing.py	88.88% <87.50%> (-11.12%)	⬇️
src/ridgeplot/_types.py	98.18% <98.03%> (+3.18%)	⬆️
src/ridgeplot/__init__.py	100.00% <100.00%> (ø)

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