docs: install "ipywidgets" warning

[sylvaincom]

Problem

When running:

from sklearn.datasets import load_breast_cancer
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import train_test_split
from skore import EstimatorReport
X_train, X_test, y_train, y_test = train_test_split(
    *load_breast_cancer(return_X_y=True), random_state=0
)
classifier = LogisticRegression(max_iter=10_000)
reporter = EstimatorReport(
    classifier,
    X_train=X_train,
    y_train=y_train,
    X_test=X_test,
    y_test=y_test,
)
reporter.cache_predictions()
reporter._cache

I got the following warning

/Users/sylvaincom/Documents/GitHub/skore/.venv/lib/python3.12/site-packages/rich/live.py:231: UserWarning: install 
"ipywidgets" for Jupyter support
  warnings.warn('install "ipywidgets" for Jupyter support')

Solution

Should we add something to the pyproject.toml as we use rich "everywhere"?

[glemaitre]

True that I added ipywidget as a dependency in my project. Here, we could consider it a soft dependencies maybe. I don't know if @rouk1 was planning to have it as a hard dependency at some point?