Add splits to MBPP dataset
CONTRIBUTOR
```
(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 ==================================================================================================

```
2022-09-07T01:38:02Z
https://github.com/huggingface/datasets/pull/4943#issuecomment-1238811947
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2022-09-07T01:38:02Z
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NONE
_The documentation is not available anymore as the PR was closed or merged._
2022-09-09T11:20:14Z
https://github.com/huggingface/datasets/pull/4943#issuecomment-1241846313
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2022-09-13T12:29:19Z
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MEMBER
Hi @cwarny ! Thanks for adding the correct splits :)

You can fix the CI error by running `make style` - this should reformat the dataset script
2022-09-09T16:31:10Z
https://github.com/huggingface/datasets/pull/4943#issuecomment-1242197880
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CONTRIBUTOR
done
2022-09-11T14:31:47Z
https://github.com/huggingface/datasets/pull/4943#issuecomment-1242977566
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This PR addresses https://github.com/huggingface/datasets/issues/4795