Add splits to MBPP dataset
```
(env) cwarny@Cedrics-Air datasets % RUN_SLOW=1 pytest tests/test_dataset_common.py::LocalDatasetTest::test_load_real_dataset_mbpp
================================================================================================ test session starts =================================================================================================
platform darwin -- Python 3.8.13, pytest-7.1.3, pluggy-1.0.0
rootdir: /Users/cwarny/datasets, configfile: setup.cfg
collected 1 item                                                                                                                                                                                                     

tests/test_dataset_common.py .                                                                                                                                                                                 [100%]

================================================================================================= 1 passed in 1.12s ==================================================================================================
(env) cwarny@Cedrics-Air datasets % RUN_SLOW=1 pytest tests/test_dataset_common.py::LocalDatasetTest::test_load_dataset_all_configs_mbpp               
================================================================================================ test session starts =================================================================================================
platform darwin -- Python 3.8.13, pytest-7.1.3, pluggy-1.0.0
rootdir: /Users/cwarny/datasets, configfile: setup.cfg
collected 1 item                                                                                                                                                                                                     

tests/test_dataset_common.py .                                                                                                                                                                                 [100%]

================================================================================================= 1 passed in 0.35s ==================================================================================================

``` _The documentation is not available anymore as the PR was closed or merged._ Hi @cwarny ! Thanks for adding the correct splits :)

You can fix the CI error by running `make style` - this should reformat the dataset script done
This PR addresses https://github.com/huggingface/datasets/issues/4795