Reproducible ML sample

[giograno]

Creating the sample we are using for our Cloud Pods tutorial (localstack/docs#399).

[whummer]

Cool, great to see this sample added @giograno ! 🚀

Only added a minor comment/suggestion regarding the wording of running the predictions through the model - technically we're not performing model evaluation here (only running prediction for the test set). If we wanted to include model evaluation as well, we could include a classification report (which compares the actual characters vs. the predicted characters) as well, see details from the tutorial here: https://scikit-learn.org/stable/auto_examples/classification/plot_digits_classification.html#classification

print(
    f"Classification report for classifier {clf}:\n"
    f"{metrics.classification_report(y_test, predicted)}\n"
)