feat(EstimatorReport): Display the mean decrease impurity

[auguste-probabl]

Closes #1323

Todo:

• Add tests on all sklearn estimators
• Add example
• Add API docs

[github-actions]

Coverage Report for backend

File	Stmts	Miss	Cover	Missing
venv/lib/python3.12/site-packages/skore
__init__.py	15	0	100%
__main__.py	8	8	0%	3–19
_config.py	28	0	100%
exceptions.py	4	4	0%	4–23
venv/lib/python3.12/site-packages/skore/persistence
__init__.py	0	0	100%
venv/lib/python3.12/site-packages/skore/persistence/item
__init__.py	56	3	93%	96–99
altair_chart_item.py	19	1	91%	14
item.py	22	1	95%	86
matplotlib_figure_item.py	36	1	95%	19
media_item.py	22	0	100%
numpy_array_item.py	27	1	94%	16
pandas_dataframe_item.py	29	1	94%	14
pandas_series_item.py	29	1	94%	14
pickle_item.py	22	0	100%
pillow_image_item.py	25	1	93%	15
plotly_figure_item.py	20	1	92%	14
polars_dataframe_item.py	27	1	94%	14
polars_series_item.py	22	1	92%	14
primitive_item.py	23	2	91%	13–15
sklearn_base_estimator_item.py	29	1	94%	15
skrub_table_report_item.py	10	1	86%	11
venv/lib/python3.12/site-packages/skore/persistence/repository
__init__.py	2	0	100%
item_repository.py	59	5	91%	15–16, 202–203, 226
venv/lib/python3.12/site-packages/skore/persistence/storage
__init__.py	4	0	100%
abstract_storage.py	22	0	100%
disk_cache_storage.py	33	1	95%	44
in_memory_storage.py	20	0	100%
venv/lib/python3.12/site-packages/skore/project
__init__.py	3	0	100%
_open.py	5	0	100%
project.py	81	1	99%	284
venv/lib/python3.12/site-packages/skore/sklearn
__init__.py	6	0	100%
_base.py	162	13	92%	43, 115, 118, 171–180, 192–>197, 212, 215–216
find_ml_task.py	61	0	99%	136–>144
types.py	13	2	85%	33, 61
venv/lib/python3.12/site-packages/skore/sklearn/_comparison
__init__.py	5	0	100%
metrics_accessor.py	164	2	97%	165, 166–>168, 1218
precision_recall_curve_display.py	73	1	97%	196–>199, 304
prediction_error_display.py	67	10	78%	97, 154–>exit, 209, 214–218, 227, 231, 236–238
report.py	64	1	96%	16, 251–>254
roc_curve_display.py	69	1	96%	204–>213, 213–>216, 308
venv/lib/python3.12/site-packages/skore/sklearn/_cross_validation
__init__.py	5	0	100%
metrics_accessor.py	170	0	99%	142–>144, 144–>146
report.py	105	1	98%	22
venv/lib/python3.12/site-packages/skore/sklearn/_estimator
__init__.py	7	0	100%
feature_importance_accessor.py	101	0	99%	336–>342
metrics_accessor.py	325	11	95%	166–175, 203–>212, 211, 241, 252–>254, 282, 309–313, 328, 351, 363, 364–>366
report.py	127	1	97%	22, 229–>235, 237–>239
venv/lib/python3.12/site-packages/skore/sklearn/_plot
__init__.py	4	0	100%
precision_recall_curve.py	129	1	98%	240–>257, 329
prediction_error.py	102	1	98%	173, 189–>192
roc_curve.py	143	0	100%
style.py	14	0	100%
utils.py	99	5	94%	31, 55–57, 61
venv/lib/python3.12/site-packages/skore/sklearn/train_test_split
__init__.py	0	0	100%
train_test_split.py	36	2	94%	16–17
venv/lib/python3.12/site-packages/skore/sklearn/train_test_split/warning
__init__.py	8	0	100%
high_class_imbalance_too_few_examples_warning.py	17	1	90%	79
high_class_imbalance_warning.py	18	0	100%
random_state_unset_warning.py	12	1	88%	15
shuffle_true_warning.py	10	1	83%	46
stratify_is_set_warning.py	12	1	88%	15
time_based_column_warning.py	23	2	86%	17, 73
train_test_split_warning.py	5	1	80%	21
venv/lib/python3.12/site-packages/skore/utils
__init__.py	6	0	100%
_accessor.py	25	0	100%
_environment.py	27	27	0%	1–51
_index.py	5	0	100%
_logger.py	22	22	0%	3–38
_parallel.py	38	3	88%	23–33, 124
_patch.py	13	5	53%	21–37
_progress_bar.py	34	0	100%
_show_versions.py	33	0	100%
TOTAL	3061	152	94%

Tests	Skipped	Failures	Errors	Time
688	3 💤	0 ❌	0 🔥	45.787s ⏱️

[github-actions]

Documentation preview @ c4f672e

[MarieSacksick]

Tested, and appart from the missing example (which will be done by enriching the current one in progress I guess?), it's good for me :) !

[glemaitre]

This PR looks good to me. Only a couple of changes to speed-up the test. In terms of documentation, I think that we should be amending the example created in the linear model PR.

[glemaitre]

To ease the integration of the documentation, I think this PR can be merged. I can have another look in this week to see if we should have subsequent works.